@article{PMFA_1956_1_5-6_a2,
     author = {H\'ajek, Otomar},
     title = {Singularity diferenci\'aln{\'\i} rovnice},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {551--559},
     year = {1956},
     volume = {1},
     number = {5-6},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1956_1_5-6_a2/}
}