Greiner, Günther Perturbing the boundary conditions of a generator. (English) Zbl 0639.47034 Houston J. Math. 13, 213-229 (1987). Reviewer: G.F.Webb MSC: 47D03 34K05 92D25 PDF BibTeX XML Cite \textit{G. Greiner}, Houston J. Math. 13, 213--229 (1987; Zbl 0639.47034) OpenURL
Marschall, Erich On the analytical generator of a group of operators. (English) Zbl 0608.47048 Indiana Univ. Math. J. 35, 289-309 (1986). MSC: 47D03 47A10 47B40 47A60 PDF BibTeX XML Cite \textit{E. Marschall}, Indiana Univ. Math. J. 35, 289--309 (1986; Zbl 0608.47048) Full Text: DOI OpenURL