@article{KYB_2007__43_2_a6,
     author = {Butkiewicz, Bohdan},
     title = {Some properties of $B$-operations},
     journal = {Kybernetika},
     pages = {197--208},
     publisher = {mathdoc},
     volume = {43},
     number = {2},
     year = {2007},
     mrnumber = {2343395},
     zbl = {1132.03348},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_2007__43_2_a6/}
}