Geodesic
The unattainability of central indices in a class of regular systems
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 4 (1987), pp. 39-44 
G. V. Osinnikova; I. N. Sergeev. The unattainability of central indices in a class of regular systems. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 4 (1987), pp. 39-44. http://geodesic.mathdoc.fr/item/VMUMM_1987_4_a9/
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     author = {G. V. Osinnikova and I. N. Sergeev},
     title = {The unattainability of central indices in a class of regular systems},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {39--44},
     year = {1987},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1987_4_a9/}
}
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