Parasyuk, E. M.; Zorij, L. M. Zur Frage der ”Multiplikation” gewöhnlicher Differentialgleichungen. (Russian) Zbl 0271.34005 Ukr. Mat. Zh. 23, 804-807 (1971). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page MSC: 34A25 Analytical theory of ordinary differential equations: series, transformations, transforms, operational calculus, etc. 34A05 Explicit solutions, first integrals of ordinary differential equations 34A30 Linear ordinary differential equations and systems PDFBibTeX XMLCite \textit{E. M. Parasyuk} and \textit{L. M. Zorij}, Ukr. Mat. Zh. 23, 804--807 (1971; Zbl 0271.34005)