@article{VMUMM_1997_1_a9,
     author = {E. E. Marenich},
     title = {Enumeration of routes in a {Boolean} algebra with respect to intersection and nonintersection relations},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {38--42},
     year = {1997},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1997_1_a9/}
}