@article{PMFA_1975__20_1_a4,
     author = {Vy\v{s}{\'\i}n, Jan},
     title = {Matematicko-didaktick\'y profil sympozia v {Bielefeldu}},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {39--44},
     publisher = {mathdoc},
     volume = {20},
     number = {1},
     year = {1975},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1975__20_1_a4/}
}