Chernyaev, A. P. Solution of linear homogeneous differential equations with variable coefficients of some class. (Russian) Zbl 0608.34010 Differ. Uravn. 20, No. 8, 1457-1459 (1984). Reviewer: J.Appell MSC: 34A30 PDFBibTeX XMLCite \textit{A. P. Chernyaev}, Differ. Uravn. 20, No. 8, 1457--1459 (1984; Zbl 0608.34010)
Kachevskij, D. N. On first integrals of a system of differential equations. (Russian) Zbl 0602.34008 Differ. Uravn. 20, No. 10, 1819-1821 (1984). Reviewer: C.Corduneanu MSC: 34A34 PDFBibTeX XMLCite \textit{D. N. Kachevskij}, Differ. Uravn. 20, No. 10, 1819--1821 (1984; Zbl 0602.34008)