@article{MASLO_1982_32_1_a3,
     author = {Zelinka, Bohdan},
     title = {On double covers of graphs},
     journal = {Mathematica slovaca},
     pages = {49--54},
     year = {1982},
     volume = {32},
     number = {1},
     mrnumber = {648219},
     zbl = {0483.05057},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1982_32_1_a3/}
}