@article{AUPO_1977__16_1_a5, author = {Stan\v{e}k, Svatoslav}, title = {A criterion for determining the 2$^nd$ order linear differential equations possessing the central dispersion with the index $n$ equal to $t+\pi$}, journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica}, pages = {75--79}, publisher = {mathdoc}, volume = {16}, number = {1}, year = {1977}, mrnumber = {0594950}, zbl = {0412.34020}, language = {en}, url = {http://geodesic.mathdoc.fr/item/AUPO_1977__16_1_a5/} }