@article{UM_1998_6_1_a3,
     author = {Calda, Emil},
     title = {Zn\'am\'a rovnost v souvislostech asi nezn\'am\'ych},
     journal = {U\v{c}itel matematiky},
     pages = {18--21},
     year = {1998},
     volume = {6},
     number = {1},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_1998_6_1_a3/}
}