@article{DA_2014_21_1_a5,
     author = {S. S. Marchenkov},
     title = {Positive closed classes in the three-valued logic},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {67--83},
     year = {2014},
     volume = {21},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2014_21_1_a5/}
}