@article{DM_1992_4_1_a11,
     author = {S. S. Marchenkov},
     title = {On completeness in the system $P_3\times P_3$},
     journal = {Diskretnaya Matematika},
     pages = {126--145},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1992_4_1_a11/}
}