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@article{MASLO_1983__33_4_a0, author = {Zelinka, Bohdan}, title = {Double covers and logics of graphs. {II.}}, journal = {Mathematica slovaca}, pages = {329--334}, publisher = {mathdoc}, volume = {33}, number = {4}, year = {1983}, mrnumber = {720501}, zbl = {0524.05058}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1983__33_4_a0/} }
Zelinka, Bohdan. Double covers and logics of graphs. II.. Mathematica slovaca, Tome 33 (1983) no. 4, pp. 329-334. http://geodesic.mathdoc.fr/item/MASLO_1983__33_4_a0/