@article{DM_1992_4_4_a8,
     author = {Nguyen Van Hoa},
     title = {On the structure of self-dual closed classes of the three-valued logic~$P_3$},
     journal = {Diskretnaya Matematika},
     pages = {82--95},
     publisher = {mathdoc},
     volume = {4},
     number = {4},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1992_4_4_a8/}
}