@article{106933, author = {Stan\v ek, Svatoslav}, title = {On asymptotic properties of central dispersions of the $k$-th kind of $y''=q(t)y$, $k=1,2,3,4$}, journal = {Archivum Mathematicum}, volume = {012}, year = {1976}, pages = {87-98}, zbl = {0355.34020}, mrnumber = {0427745}, language = {en}, url = {http://dml.mathdoc.fr/item/106933} }
Staněk, Svatoslav. On asymptotic properties of central dispersions of the $k$-th kind of $y''=q(t)y$, $k=1,2,3,4$. Archivum Mathematicum, Tome 012 (1976) pp. 87-98. http://gdmltest.u-ga.fr/item/106933/
Linear Differential Transformations of the Second Order, The English Universities Press Ltd., London 197L | MR 0463539
Ordinary differential equations, (in Russian), Moscow 1970. (1970) | Zbl 0214.09101
Linear Differential Equations in the Real Domain, New York, W. W. Norton Company, 1963. (1963) | MR 0156014
Asymptotic properties of the dispersions of the differential equations y" = q(t)y, Arch. Math. 2 (Brno), XI (1975), 85-98. (1975) | MR 0407379
Comparison and Oscillation Theory of Linear Differential Equations, Academic Press New York and London 1968. (1968) | MR 0463570 | Zbl 0191.09904