@article{MASLO_1983_33_4_a0,
     author = {Zelinka, Bohdan},
     title = {Double covers and logics of graphs. {II}},
     journal = {Mathematica slovaca},
     pages = {329--334},
     year = {1983},
     volume = {33},
     number = {4},
     mrnumber = {720501},
     zbl = {0524.05058},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1983_33_4_a0/}
}