@article{120109, author = {Miroslav Laitoch}, title = {A note on linear differential equations of the second order with the same basic central dispersion of the first kind}, journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica}, volume = {20}, year = {1981}, pages = {59-64}, zbl = {0486.34008}, mrnumber = {0645888}, language = {en}, url = {http://dml.mathdoc.fr/item/120109} }
Laitoch, Miroslav. A note on linear differential equations of the second order with the same basic central dispersion of the first kind. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, Tome 20 (1981) pp. 59-64. http://gdmltest.u-ga.fr/item/120109/
Lineare Differentialtransformationen 2. Ordnung, VEB DVW, Berlin 1967. (1967)