Geodesic
Stability of $\Pi$-systems
Differencialʹnye uravneniâ, Tome 27 (1991) no. 8, pp. 1334-1344 
A. A. Levakov. Stability of $\Pi$-systems. Differencialʹnye uravneniâ, Tome 27 (1991) no. 8, pp. 1334-1344. http://geodesic.mathdoc.fr/item/DE_1991_27_8_a6/
@article{DE_1991_27_8_a6,
     author = {A. A. Levakov},
     title = {Stability of $\Pi$-systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1334--1344},
     year = {1991},
     volume = {27},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_8_a6/}
}
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