Rajović, Miloje; Stojiljković, Rade The first, the second, and the third Liouville formula and periodical solutions of linear differential equation of the second order. (English) Zbl 1224.34123 Kragujevac J. Math. 30, 131-139 (2007). Cited in 1 Document MSC: 34C25 Periodic solutions to ordinary differential equations 34A30 Linear ordinary differential equations and systems, general PDF BibTeX XML Cite \textit{M. Rajović} and \textit{R. Stojiljković}, Kragujevac J. Math. 30, 131--139 (2007; Zbl 1224.34123)