@article{UM_1996__4_4_a2,
     author = {Calda, Emil},
     title = {Po del\v{s}{\'\i} dob\v{e} op\v{e}t o {Vennov\'ych} diagramech},
     journal = {U\v{c}itel matematiky},
     pages = {201--204},
     publisher = {mathdoc},
     volume = {04},
     number = {4},
     year = {1996},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/item/UM_1996__4_4_a2/}
}