@article{PMFA_1959__4_6_a2,
     author = {Dubnov, Ja. S.},
     title = {Trigonometrie ve \v{s}koln{\'\i}m kursu geometrie},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {664--673},
     publisher = {mathdoc},
     volume = {04},
     number = {6},
     year = {1959},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1959__4_6_a2/}
}