@article{DM_2008_20_3_a7,
     author = {S. S. Marchenkov},
     title = {The closure operator with the equality predicate branching on the set of partial {Boolean} functions},
     journal = {Diskretnaya Matematika},
     pages = {80--88},
     publisher = {mathdoc},
     volume = {20},
     number = {3},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2008_20_3_a7/}
}