@article{DA_2018_25_4_a3,
     author = {S. S. Marchenkov},
     title = {Extensions of the positive closure operator by using logical connectives},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {46--58},
     publisher = {mathdoc},
     volume = {25},
     number = {4},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2018_25_4_a3/}
}