@article{VMUMM_1997_3_a1,
     author = {V. B. Alekseev and M. M. Krivenko},
     title = {On the complexity of the recognition of the completeness of systems of functions in the class $P_3^*$},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {6--9},
     year = {1997},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1997_3_a1/}
}