Geodesic
The first, the second, and the third Liouville formula and periodical solutions of linear differential equation of the second order
Kragujevac Journal of Mathematics, Tome 30 (2007) no. 1 Cet article a éte moissonné depuis la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

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In this paper, the need for reviving the classical theory of Liouville is emphasized, in order to determine only periodical solutions of linear differential equations this time. \\ This problem, being one of the most important problems in the practice of differential equations (Mechanics, Mechanical engineering, Electronics) due to fast and in a way impulsive development of these sciences, has not been sufficiently systematically solved. 
@article{KJM_2007_30_1_a8,
     author = {Miloje Rajovi\'c and Rade Stojiljkovi\'c},
     title = {The first, the second, and the third {Liouville} formula and periodical solutions of linear differential equation of the second order},
     journal = {Kragujevac Journal of Mathematics},
     pages = {131 - 139},
     year = {2007},
     volume = {30},
     number = {1},
     zbl = {1224.34123},
     url = {http://geodesic.mathdoc.fr/item/KJM_2007_30_1_a8/}
}
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Miloje Rajović; Rade Stojiljković. The first, the second, and the third Liouville formula and periodical solutions of linear differential equation of the second order. Kragujevac Journal of Mathematics, Tome 30 (2007) no. 1. http://geodesic.mathdoc.fr/item/KJM_2007_30_1_a8/