@article{MASLO_1965_15_2_a3,
     author = {Zelinka, Bohdan},
     title = {Pr\r{u}m\v{e}r grafu syst\'emu vlastn{\'\i}ch podpologrup komutativn{\'\i} pologrupy},
     journal = {Mathematica slovaca},
     pages = {143--145},
     year = {1965},
     volume = {15},
     number = {2},
     mrnumber = {0190041},
     zbl = {0134.02504},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1965_15_2_a3/}
}