@article{PMFA_2000_45_3_a5,
     author = {Pyrih, Pavel},
     title = {Open {Problem} {Seminar}},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {257--258},
     year = {2000},
     volume = {45},
     number = {3},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_2000_45_3_a5/}
}