@article{DM_2017_29_2_a3,
     author = {S. S. Marchenkov and A. V. Chernyshev},
     title = {Basic positively closed classes in three-valued logic},
     journal = {Diskretnaya Matematika},
     pages = {40--52},
     publisher = {mathdoc},
     volume = {29},
     number = {2},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2017_29_2_a3/}
}