@article{10_21136_CMJ_1983_101887,
     author = {Zelinka, Bohdan},
     title = {Double covers and logics of graphs},
     journal = {Czechoslovak Mathematical Journal},
     pages = {354--360},
     publisher = {mathdoc},
     volume = {33},
     number = {3},
     year = {1983},
     doi = {10.21136/CMJ.1983.101887},
     mrnumber = {718920},
     zbl = {0537.05070},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1983.101887/}
}