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@article{UM_2006__14_4_a2, author = {Jan\'a\v{c}kov\'a, Martina}, title = {Pre\v{c}o s\'u niektor\'e kombinatorick\'e \'ulohy \v{t}a\v{z}k\'e? (2)}, journal = {U\v{c}itel matematiky}, pages = {211--217}, publisher = {mathdoc}, volume = {14}, number = {4}, year = {2006}, language = {sl}, url = {http://geodesic.mathdoc.fr/item/UM_2006__14_4_a2/} }
Janáčková, Martina. Prečo sú niektoré kombinatorické úlohy ťažké? (2). Učitel matematiky, Tome 14 (2006) no. 4, pp. 211-217. http://geodesic.mathdoc.fr/item/UM_2006__14_4_a2/