Falomir, H.; Pisani, P. A. G. Krein’s formula and heat-kernel expansion for some differential operators with a regular singularity. (English) Zbl 1103.81015 J. Phys. A, Math. Gen. 39, No. 21, 6333-6340 (2006). MSC: 81Q10 47A55 47E05 58J35 58J37 81T16 PDFBibTeX XMLCite \textit{H. Falomir} and \textit{P. A. G. Pisani}, J. Phys. A, Math. Gen. 39, No. 21, 6333--6340 (2006; Zbl 1103.81015) Full Text: DOI arXiv
Fernández, Francisco M. On an alternative perturbation method in quantum mechanics. (English) Zbl 1085.81045 J. Phys. A, Math. Gen. 39, No. 7, 1683-1689 (2006). MSC: 81Q15 34E10 PDFBibTeX XMLCite \textit{F. M. Fernández}, J. Phys. A, Math. Gen. 39, No. 7, 1683--1689 (2006; Zbl 1085.81045) Full Text: DOI
Barakat, T. The asymptotic iteration method for the eigenenergies of the Schrödinger equation with the potential \(V(r) = -Z/r + gr + \lambda r^2\). (English) Zbl 1091.81024 J. Phys. A, Math. Gen. 39, No. 4, 823-831 (2006). MSC: 81Q10 81-04 81Q15 41A60 34E10 PDFBibTeX XMLCite \textit{T. Barakat}, J. Phys. A, Math. Gen. 39, No. 4, 823--831 (2006; Zbl 1091.81024) Full Text: DOI
Gilkey, P.; Kirsten, K.; Park, J.-H. Eta invariants with spectral boundary conditions. (English) Zbl 1083.58027 J. Phys. A, Math. Gen. 38, No. 37, 8103-8122 (2005). Reviewer: Jan Kurek (Lublin) MSC: 58J28 58J32 58J37 58J50 PDFBibTeX XMLCite \textit{P. Gilkey} et al., J. Phys. A, Math. Gen. 38, No. 37, 8103--8122 (2005; Zbl 1083.58027) Full Text: DOI arXiv
Aoki, Takashi; Kawai, Takahiro; Sasaki, Shunsuke; Shudo, Akira; Takei, Yoshitsugu Virtual turning points and bifurcation of Stokes curves for higher order ordinary differential equations. (English) Zbl 1073.34098 J. Phys. A, Math. Gen. 38, No. 15, 3317-3336 (2005). Reviewer: Vladimir P. Kostov (Nice) MSC: 34M40 34M60 34M55 34M30 34E20 PDFBibTeX XMLCite \textit{T. Aoki} et al., J. Phys. A, Math. Gen. 38, No. 15, 3317--3336 (2005; Zbl 1073.34098) Full Text: DOI arXiv
Esposito, Giampiero; Gilkey, Peter; Kirsten, Klaus Heat kernel coefficients for chiral bag boundary conditions. (English) Zbl 1060.58016 J. Phys. A, Math. Gen. 38, No. 10, 2259-2276 (2005). MSC: 58J37 58J50 PDFBibTeX XMLCite \textit{G. Esposito} et al., J. Phys. A, Math. Gen. 38, No. 10, 2259--2276 (2005; Zbl 1060.58016) Full Text: DOI arXiv
Kapaev, A. A. Quasi-linear Stokes phenomenon for the Painlevé first equation. (English) Zbl 1080.34071 J. Phys. A, Math. Gen. 37, No. 46, 11149-11167 (2004). Reviewer: Chaman Lal Koul (Jaipur) MSC: 34M40 34M55 PDFBibTeX XMLCite \textit{A. A. Kapaev}, J. Phys. A, Math. Gen. 37, No. 46, 11149--11167 (2004; Zbl 1080.34071) Full Text: DOI arXiv
Amore, Paolo; Aranda, Alfredo; De Pace, Arturo A new method for the solution of the Schrödinger equation. (English) Zbl 1044.81026 J. Phys. A, Math. Gen. 37, No. 10, 3515-3525 (2004). MSC: 81Q05 34E10 34L40 35J10 PDFBibTeX XMLCite \textit{P. Amore} et al., J. Phys. A, Math. Gen. 37, No. 10, 3515--3525 (2004; Zbl 1044.81026) Full Text: DOI arXiv
Bogomolny, E.; Bohigas, O.; Schmit, C. Spectral properties of distance matrices. (English) Zbl 1057.15027 J. Phys. A, Math. Gen. 36, No. 12, 3595-3616 (2003). Reviewer: T. Nôno (Hiroshima) MSC: 15B52 15A18 60F05 PDFBibTeX XMLCite \textit{E. Bogomolny} et al., J. Phys. A, Math. Gen. 36, No. 12, 3595--3616 (2003; Zbl 1057.15027) Full Text: DOI arXiv
Bleher, Pavel; Eynard, Bertrand Double scaling limit in random matrix models and a nonlinear hierarchy of differential equations. (English) Zbl 1053.15017 J. Phys. A, Math. Gen. 36, No. 12, 3085-3105 (2003). Reviewer: Fabio L. Toninelli (Lyon) MSC: 15B52 82B44 82B41 34M30 37K10 PDFBibTeX XMLCite \textit{P. Bleher} and \textit{B. Eynard}, J. Phys. A, Math. Gen. 36, No. 12, 3085--3105 (2003; Zbl 1053.15017) Full Text: DOI arXiv
Álvarez, Gabriel; Howls, Christopher J.; Silverstone, Harris J. Dispersive hyperasymptotics and the anharmonic oscillator. (English) Zbl 1042.81018 J. Phys. A, Math. Gen. 35, No. 18, 4017-4042 (2002). MSC: 81Q15 34E05 34E10 34E18 81U20 PDFBibTeX XMLCite \textit{G. Álvarez} et al., J. Phys. A, Math. Gen. 35, No. 18, 4017--4042 (2002; Zbl 1042.81018) Full Text: DOI Link
Álvarez, Gabriel; Howls, Christopher J.; Silverstone, Harris J. Anharmonic oscillator discontinuity formulae up to second-exponentially-small order. (English) Zbl 1042.81017 J. Phys. A, Math. Gen. 35, No. 18, 4003-4016 (2002). MSC: 81Q15 34E05 34E10 34E18 PDFBibTeX XMLCite \textit{G. Álvarez} et al., J. Phys. A, Math. Gen. 35, No. 18, 4003--4016 (2002; Zbl 1042.81017) Full Text: DOI Link
Exner, P.; Yoshitomi, K. Persistent currents for the 2D Schrödinger operator with a strong \(\delta\)-interaction on a loop. (English) Zbl 1010.81012 J. Phys. A, Math. Gen. 35, No. 15, 3479-3487 (2002). MSC: 81Q05 35P20 35Q40 81V10 PDFBibTeX XMLCite \textit{P. Exner} and \textit{K. Yoshitomi}, J. Phys. A, Math. Gen. 35, No. 15, 3479--3487 (2002; Zbl 1010.81012) Full Text: DOI arXiv
Sire, Clément; Krapivsky, Paul L. Random Fibonacci sequences. (English) Zbl 0996.60111 J. Phys. A, Math. Gen. 34, No. 42, 9065-9083 (2001). Reviewer: Wolfgang König (Berlin) MSC: 60K99 34E10 37M25 PDFBibTeX XMLCite \textit{C. Sire} and \textit{P. L. Krapivsky}, J. Phys. A, Math. Gen. 34, No. 42, 9065--9083 (2001; Zbl 0996.60111) Full Text: DOI arXiv
Eynard, B. Asymptotics of skew orthogonal polynomials. (English) Zbl 0991.15015 J. Phys. A, Math. Gen. 34, No. 37, 7591-7605 (2001). Reviewer: Costică Moroşanu (Iaşi) MSC: 15B52 82B41 42C05 PDFBibTeX XMLCite \textit{B. Eynard}, J. Phys. A, Math. Gen. 34, No. 37, 7591--7605 (2001; Zbl 0991.15015) Full Text: DOI arXiv
Lenoble, O.; Pastur, L. On the asymptotic behaviour of correlators of multi-cut matrix models. (English) Zbl 0999.82043 J. Phys. A, Math. Gen. 34, No. 30, L409-L415 (2001). MSC: 82B44 33C45 PDFBibTeX XMLCite \textit{O. Lenoble} and \textit{L. Pastur}, J. Phys. A, Math. Gen. 34, No. 30, L409--L415 (2001; Zbl 0999.82043) Full Text: DOI
Exner, P.; Krejčiřík, D. Bound states in mildly curved layers. (English) Zbl 0981.81022 J. Phys. A, Math. Gen. 34, No. 30, 5969-5985 (2001). MSC: 81Q05 81V35 PDFBibTeX XMLCite \textit{P. Exner} and \textit{D. Krejčiřík}, J. Phys. A, Math. Gen. 34, No. 30, 5969--5985 (2001; Zbl 0981.81022) Full Text: DOI arXiv
Casas, F.; Oteo, J. A.; Ros, J. Floquet theory: Exponential perturbative treatment. (English) Zbl 0984.34046 J. Phys. A, Math. Gen. 34, No. 16, 3379-3388 (2001). Reviewer: Svitlana P.Rogovchenko (Famagusta) MSC: 34E10 34A26 81Q05 34A30 34C25 PDFBibTeX XMLCite \textit{F. Casas} et al., J. Phys. A, Math. Gen. 34, No. 16, 3379--3388 (2001; Zbl 0984.34046) Full Text: DOI
Gilkey, Peter; Kirsten, Klaus; Park, JeongHyeong Heat trace asymptotics of a time-dependent process. (English) Zbl 0977.58022 J. Phys. A, Math. Gen. 34, No. 6, 1153-1168 (2001). Reviewer: Th.M.Rassias (Athens) MSC: 58J35 35P05 PDFBibTeX XMLCite \textit{P. Gilkey} et al., J. Phys. A, Math. Gen. 34, No. 6, 1153--1168 (2001; Zbl 0977.58022) Full Text: DOI arXiv
Chen, Yang; Lawrence, Nigel Small eigenvalues of large Hankel matrices. (English) Zbl 0999.15007 J. Phys. A, Math. Gen. 32, No. 42, 7305-7315 (1999). MSC: 15A18 47B35 82B99 82B26 15B52 15B57 PDFBibTeX XMLCite \textit{Y. Chen} and \textit{N. Lawrence}, J. Phys. A, Math. Gen. 32, No. 42, 7305--7315 (1999; Zbl 0999.15007) Full Text: DOI arXiv
Bordag, M.; Vassilevic, D. V. Heat kernel expansion for semitransparent boundaries. (English) Zbl 0969.81044 J. Phys. A, Math. Gen. 32, No. 47, 8247-8259 (1999). MSC: 81T15 35K05 81Q15 PDFBibTeX XMLCite \textit{M. Bordag} and \textit{D. V. Vassilevic}, J. Phys. A, Math. Gen. 32, No. 47, 8247--8259 (1999; Zbl 0969.81044) Full Text: DOI arXiv
Bytsenko, A. A.; Williams, F. L. Asymptotics of the heat kernel on rank-\(1\) locally symmetric spaces. (English) Zbl 0953.58020 J. Phys. A, Math. Gen. 32, No. 31, 5773-5779 (1999). Reviewer: Ken S.Richardson (Fort Worth) MSC: 58J35 58J37 58J52 PDFBibTeX XMLCite \textit{A. A. Bytsenko} and \textit{F. L. Williams}, J. Phys. A, Math. Gen. 32, No. 31, 5773--5779 (1999; Zbl 0953.58020) Full Text: DOI arXiv
Kochmański, Martin S. Low-temperature asymptotics for the Ising model in an external magnetic field. (English) Zbl 0964.82005 J. Phys. A, Math. Gen. 32, No. 7, 1251-1259 (1999). MSC: 82B20 82B80 PDFBibTeX XMLCite \textit{M. S. Kochmański}, J. Phys. A, Math. Gen. 32, No. 7, 1251--1259 (1999; Zbl 0964.82005) Full Text: DOI
Gilkey, P. The heat content asymptotics for variable geometries. (English) Zbl 0953.58021 J. Phys. A, Math. Gen. 32, No. 15, 2825-2834 (1999). Reviewer: Ken S.Richardson (Fort Worth) MSC: 58J35 58J37 PDFBibTeX XMLCite \textit{P. Gilkey}, J. Phys. A, Math. Gen. 32, No. 15, 2825--2834 (1999; Zbl 0953.58021) Full Text: DOI Link
Berglund, N.; Kunz, H. Memory effects and scaling laws in slowly driven systems. (English) Zbl 0917.34048 J. Phys. A, Math. Gen. 32, No. 1, 15-39 (1999). MSC: 34E10 82C26 34C25 PDFBibTeX XMLCite \textit{N. Berglund} and \textit{H. Kunz}, J. Phys. A, Math. Gen. 32, No. 1, 15--39 (1999; Zbl 0917.34048) Full Text: DOI arXiv
Bernard, Denis; Gawȩdzki, Krzysztof Scaling and exotic regimes in decaying Burgers turbulence. (English) Zbl 0959.76032 J. Phys. A, Math. Gen. 31, No. 44, 8735-8743 (1998). MSC: 76F55 76M55 35Q53 76M35 PDFBibTeX XMLCite \textit{D. Bernard} and \textit{K. Gawȩdzki}, J. Phys. A, Math. Gen. 31, No. 44, 8735--8743 (1998; Zbl 0959.76032) Full Text: DOI arXiv
Chen, Yang; Ismail, Mourad E. H. Asymptotics of the largest zeros of some orthogonal polynomials. (English) Zbl 0943.33009 J. Phys. A, Math. Gen. 31, No. 25, 5525-5544 (1998). Reviewer: Matthew He (Ft.Lauderdale) MSC: 33D45 PDFBibTeX XMLCite \textit{Y. Chen} and \textit{M. E. H. Ismail}, J. Phys. A, Math. Gen. 31, No. 25, 5525--5544 (1998; Zbl 0943.33009) Full Text: DOI
Gerdjikov, V. S.; Evstatiev, E. G.; Ivanov, R. I. The complex Toda chains and the simple Lie algebras – solutions and large time asymptotics. (English) Zbl 0952.37049 J. Phys. A, Math. Gen. 31, No. 40, 8221-8232 (1998). Reviewer: Samir Musayev (Baku) MSC: 37K30 17B81 37K40 PDFBibTeX XMLCite \textit{V. S. Gerdjikov} et al., J. Phys. A, Math. Gen. 31, No. 40, 8221--8232 (1998; Zbl 0952.37049) Full Text: DOI arXiv
Znojil, Miloslav A quick perturbative method for Schrödinger equations. (English) Zbl 0927.34076 J. Phys. A, Math. Gen. 30, No. 24, 8771-8783 (1997). MSC: 34L40 81Q15 34E10 35J10 65L06 PDFBibTeX XMLCite \textit{M. Znojil}, J. Phys. A, Math. Gen. 30, No. 24, 8771--8783 (1997; Zbl 0927.34076) Full Text: DOI
Van Canneyt, M.; Wojtkiewicz, J. Fluctuations in an asymmetric anharmonic crystal. (English) Zbl 0935.82029 J. Phys. A, Math. Gen. 30, No. 17, 5959-5970 (1997). MSC: 82C26 82C10 82D25 PDFBibTeX XMLCite \textit{M. Van Canneyt} and \textit{J. Wojtkiewicz}, J. Phys. A, Math. Gen. 30, No. 17, 5959--5970 (1997; Zbl 0935.82029) Full Text: DOI
Nandi, T. K.; Bera, P. K.; Panja, M. M.; Talukdar, B. The Dalgarno-Lewis method as a perturbation theory. (English) Zbl 0916.34072 J. Phys. A, Math. Gen. 29, No. 5, 1101-1105 (1996). MSC: 34L40 81Q15 34E10 PDFBibTeX XMLCite \textit{T. K. Nandi} et al., J. Phys. A, Math. Gen. 29, No. 5, 1101--1105 (1996; Zbl 0916.34072) Full Text: DOI
Krivitsky, D. S. Numerical solution of the Smoluchowski kinetic equation and asymptotics of the distribution function. (English) Zbl 0830.65143 J. Phys. A, Math. Gen. 28, No. 7, 2025-2039 (1995). MSC: 65R20 45K05 85A05 PDFBibTeX XMLCite \textit{D. S. Krivitsky}, J. Phys. A, Math. Gen. 28, No. 7, 2025--2039 (1995; Zbl 0830.65143) Full Text: DOI
Huillet, Thierry; Jeannet, Bernard Random walk models for multifractals. (English) Zbl 0847.60090 J. Phys. A, Math. Gen. 27, No. 19, 6315-6334 (1994). MSC: 60K35 82B41 PDFBibTeX XMLCite \textit{T. Huillet} and \textit{B. Jeannet}, J. Phys. A, Math. Gen. 27, No. 19, 6315--6334 (1994; Zbl 0847.60090) Full Text: DOI
Berry, M. V.; Keating, Jonathan P. Persistent current flux correlations calculated by quantum chaology. (English) Zbl 0843.58088 J. Phys. A, Math. Gen. 27, No. 18, 6167-6176 (1994). MSC: 81Q50 81Q20 82C41 PDFBibTeX XMLCite \textit{M. V. Berry} and \textit{J. P. Keating}, J. Phys. A, Math. Gen. 27, No. 18, 6167--6176 (1994; Zbl 0843.58088) Full Text: DOI Link
Albeverio, S.; Brzeźniak, Z.; Dąbrowski, L. Time-dependent propagator with point interaction. (English) Zbl 0841.34086 J. Phys. A, Math. Gen. 27, No. 14, 4933-4943 (1994). MSC: 34L40 81Q05 PDFBibTeX XMLCite \textit{S. Albeverio} et al., J. Phys. A, Math. Gen. 27, No. 14, 4933--4943 (1994; Zbl 0841.34086) Full Text: DOI
Xu, Dianyan; Xu, Xiaofeng Heat kernel expansion and energy-momentum tensor for fermion field at finite temperature in curved spacetime. (English) Zbl 0836.58039 J. Phys. A, Math. Gen. 26, No. 24, 7521-7536 (1993). MSC: 58J35 58J37 81T20 83C47 PDFBibTeX XMLCite \textit{D. Xu} and \textit{X. Xu}, J. Phys. A, Math. Gen. 26, No. 24, 7521--7536 (1993; Zbl 0836.58039) Full Text: DOI
Gekhtman, M. I. Non-Abelian nonlinear lattice equations on finite interval. (English) Zbl 0809.35104 J. Phys. A, Math. Gen. 26, No. 22, 6303-6317 (1993). MSC: 35Q53 35Q55 35B40 39A12 PDFBibTeX XMLCite \textit{M. I. Gekhtman}, J. Phys. A, Math. Gen. 26, No. 22, 6303--6317 (1993; Zbl 0809.35104) Full Text: DOI
Coveney, P. V.; Penrose, O. Reply to comments by George and Prigogine on the paper ‘On the validity of the Brussels formalism in statistical mechanics’. (English) Zbl 0793.60115 J. Phys. A, Math. Gen. 26, No. 15, 3907 (1993). MSC: 60K40 82B03 PDFBibTeX XMLCite \textit{P. V. Coveney} and \textit{O. Penrose}, J. Phys. A, Math. Gen. 26, No. 15, 3907 (1993; Zbl 0793.60115) Full Text: DOI
George, C. D.; Prigogine, I. Comments on the paper by Coveney and Penrose ‘On the validity of the Brussels formalism in statistical mechanics’. (English) Zbl 0793.60114 J. Phys. A, Math. Gen. 26, No. 15, 3905 (1993). MSC: 60K40 82B03 PDFBibTeX XMLCite \textit{C. D. George} and \textit{I. Prigogine}, J. Phys. A, Math. Gen. 26, No. 15, 3905 (1993; Zbl 0793.60114) Full Text: DOI
McAvity, D. M. Surface energy from heat content asymptotics. (English) Zbl 0772.58067 J. Phys. A, Math. Gen. 26, No. 4, 823-830 (1993). MSC: 58J90 58J35 78A30 PDFBibTeX XMLCite \textit{D. M. McAvity}, J. Phys. A, Math. Gen. 26, No. 4, 823--830 (1993; Zbl 0772.58067) Full Text: DOI
Ermakov, M. S. Minimax estimation in a deconvolution problem. (English) Zbl 0765.62080 J. Phys. A, Math. Gen. 25, No. 5, 1273-1282 (1992). Reviewer: L.B.Merkulovich (St.Peterburg) MSC: 62M09 62G20 62G99 PDFBibTeX XMLCite \textit{M. S. Ermakov}, J. Phys. A, Math. Gen. 25, No. 5, 1273--1282 (1992; Zbl 0765.62080) Full Text: DOI
Vrscay, Edward R. Irregular behaviour arising from quasiperiodic forcing of simple quantum systems: Insight from perturbation theory. (English) Zbl 0755.34052 J. Phys. A, Math. Gen. 24, No. 9, L463-L468 (1991). MSC: 34E10 34C27 34B30 81Q15 PDFBibTeX XMLCite \textit{E. R. Vrscay}, J. Phys. A, Math. Gen. 24, No. 9, L463--L468 (1991; Zbl 0755.34052) Full Text: DOI
Grecchi, Vincenzo; Sacchetti, Andrea Weak-field magnetic bands in superlattices and the single-band approximation. (English) Zbl 0709.47059 J. Phys. A, Math. Gen. 22, No. 22, 4989-5006 (1989). MSC: 47N50 81T25 81V10 PDFBibTeX XMLCite \textit{V. Grecchi} and \textit{A. Sacchetti}, J. Phys. A, Math. Gen. 22, No. 22, 4989--5006 (1989; Zbl 0709.47059) Full Text: DOI
Saitō, Yoshimi Inverse scattering for the plasma wave equation starting with large-t data. (English) Zbl 0696.35157 J. Phys. A 21, No. 7, 1623-1631 (1988). MSC: 35Q99 35R30 35B40 PDFBibTeX XMLCite \textit{Y. Saitō}, J. Phys. A, Math. Gen. 21, No. 7, 1623--1631 (1988; Zbl 0696.35157) Full Text: DOI
Góra, Pawel Approximate master equations for an exactly solvable quantum system. (English) Zbl 0654.60064 J. Phys. A 21, No. 9, 2061-2073 (1988). MSC: 60J70 60K35 81P20 PDFBibTeX XMLCite \textit{P. Góra}, J. Phys. A, Math. Gen. 21, No. 9, 2061--2073 (1988; Zbl 0654.60064) Full Text: DOI
Znojil, M. A simplified fixed-point perturbation theory. I. The method. (English) Zbl 0622.34061 J. Phys. A 20, 907-914 (1987). MSC: 34E10 PDFBibTeX XMLCite \textit{M. Znojil}, J. Phys. A, Math. Gen. 20, 907--914 (1987; Zbl 0622.34061) Full Text: DOI
Šeba, Petr; Englisch, Harald Perturbation theory for point interactions in three dimensions. (English) Zbl 0607.34053 J. Phys. A 19, 711-716 (1986). MSC: 34E10 34L99 34D10 PDFBibTeX XMLCite \textit{P. Šeba} and \textit{H. Englisch}, J. Phys. A, Math. Gen. 19, 711--716 (1986; Zbl 0607.34053) Full Text: DOI
Buldyrev, V. S.; Nomofilov, V. E. Asymptotic solutions of an elliptic equation system on a Riemannian manifold concentrated in the vicinity of a phase trajectory. (English) Zbl 0479.35034 J. Phys. A 14, 1577-1585 (1981). MSC: 35J45 35B40 58B20 76W05 83C99 PDFBibTeX XMLCite \textit{V. S. Buldyrev} and \textit{V. E. Nomofilov}, J. Phys. A, Math. Gen. 14, 1577--1585 (1981; Zbl 0479.35034) Full Text: DOI
Moraux, Marie-Pierre; Fijalkow, Eric; Feix, Marc R. Asymptotic solutions of time dependent anharmonic oscillator equation. (English) Zbl 0471.34043 J. Phys. A 14, 1611-1619 (1981). MSC: 34E05 34C10 PDFBibTeX XMLCite \textit{M.-P. Moraux} et al., J. Phys. A, Math. Gen. 14, 1611--1619 (1981; Zbl 0471.34043) Full Text: DOI
Matsuno, Y. Exact multi-soliton solution of the Benjamin-Ono equation. (English) Zbl 0399.45014 J. Physics A 12, 619-621 (1979). MSC: 45K05 45M05 PDFBibTeX XMLCite \textit{Y. Matsuno}, J. Phys. A, Math. Gen. 12, 619--621 (1979; Zbl 0399.45014) Full Text: DOI
Sedlacek, Z. The averaged Hamiltonian of a time-independent nearly multiple-periodic system. (English) Zbl 0318.70012 J. Physics A 8, 1384-1389 (1975). MSC: 70H99 70K99 34E10 PDFBibTeX XMLCite \textit{Z. Sedlacek}, J. Phys. A, Math. Gen. 8, 1384--1389 (1975; Zbl 0318.70012) Full Text: DOI