@article{VMUMM_1996_4_a1,
     author = {S. A. Gizunov and V. A. Nosov},
     title = {Complexity of recognition of {Schaefer} classes},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {7--12},
     publisher = {mathdoc},
     number = {4},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1996_4_a1/}
}