@article{104722,
author = {Franti\v sek Neuman},
title = {A note on differential equations with periodic solutions},
journal = {Archivum Mathematicum},
volume = {006},
year = {1970},
pages = {189-192},
zbl = {0241.34028},
mrnumber = {0320411},
language = {en},
url = {http://dml.mathdoc.fr/item/104722}
}
Neuman, František. A note on differential equations with periodic solutions. Archivum Mathematicum, Tome 006 (1970) pp. 189-192. http://gdmltest.u-ga.fr/item/104722/
Linear Differentialtransformationen 2. Ordnung, VEB, Berlin 1967. (1967)
Extremal Property of the Equation $y" =-k^2 y$, Archivum Mathematicum (Brno), T. 8 (1907), 161-164. (1907) | MR 0236465
Construction of Differential Equations with Coexisting Periodic Solutions, to appear in Bul. Inst. Polit. din Jaşi. | MR 0283305 | Zbl 0267.34039