@article{RMF_2006_81_1_a1,
     author = {Calda, Emil},
     title = {Apolloniova kru\v{z}nice a kruhov\'y kule\v{c}n{\'\i}k},
     journal = {Rozhledy matematicko-fyzik\'aln{\'\i}},
     pages = {9--15},
     year = {2006},
     volume = {81},
     number = {1},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/RMF_2006_81_1_a1/}
}