@article{VMUMM_1991_3_a1,
     author = {V. A. Uspenskii and V. E. Plisko},
     title = {Diagnostic propositional formulas},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {7--12},
     publisher = {mathdoc},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1991_3_a1/}
}