@article{DA_2010_17_4_a1,
     author = {S. S. Marchenkov},
     title = {The closure operator in many-valued logic based on functional equations},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {18--31},
     publisher = {mathdoc},
     volume = {17},
     number = {4},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2010_17_4_a1/}
}