@article{104843,
author = {Erich Barv\'\i nek},
title = {An abstract model of linear differential transformations},
journal = {Archivum Mathematicum},
volume = {011},
year = {1975},
pages = {67-77},
zbl = {0373.34003},
mrnumber = {0407381},
language = {en},
url = {http://dml.mathdoc.fr/item/104843}
}
Barvínek, Erich. An abstract model of linear differential transformations. Archivum Mathematicum, Tome 011 (1975) pp. 67-77. http://gdmltest.u-ga.fr/item/104843/
Linear Differential Transformations of the Second Order, Thе English Univеrsitiеs Pгеss, London 1971. (1971) | MR 0463539
Über eine Charakterisierung der allgemeinen Dispersionen linearer Differentialgleichungen 2. Ordnung, Mаth. Nаchг. Bd. 38 (1968), H. 5/6, 261-266. (1968) | MR 0244540
On distribution of zeros of solutions and their derivatives of the equations $y'' = Q(t) у$, (іп Czеch), Actа F. R. N. Univ. Comеn. V, 8-10 Mаtеmаticа, 1961. (1961)