@article{RMF_2005_80_2_a2,
     author = {Calda, Emil},
     title = {Pokr\'yv\'an{\'\i} \v{s}achovnice},
     journal = {Rozhledy matematicko-fyzik\'aln{\'\i}},
     pages = {16--20},
     year = {2005},
     volume = {80},
     number = {2},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/RMF_2005_80_2_a2/}
}