Boruvka, O. Theorie der globalen Eigenschaften gewöhnlicher linearer Differentialgleichungen zweiter Ordnung. (Russian) Zbl 0348.34007 Differ. Uravn. 12, 1347-1383 (1976). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 Review MSC: 34A30 Linear ordinary differential equations and systems 34-02 Research exposition (monographs, survey articles) pertaining to ordinary differential equations 34C10 Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations 34C25 Periodic solutions to ordinary differential equations PDF BibTeX XML Cite \textit{O. Boruvka}, Differ. Uravn. 12, 1347--1383 (1976; Zbl 0348.34007)