https://catalogue-scientifique.canada.ca/record=1232304~S6*frc
Rechercher Kreĭn, M. G; Rechercher I︡Akubovich, V. A; Rechercher Leifman, Lev ︠I︡A; Rechercher Kreĭn, Mark Grigorʹevich; Rechercher Yakubovich, V. A; Rechercher Jakubovič, V. A; Rechercher I︡Akubovich, Vladimir Andreevich; Rechercher Leĭfman, L. ︠I︡A; Rechercher Leifman, Lev ︠I︡Akovlevich; Rechercher Leifman, Lev J
American Mathematical Society, 1983, ISBN : 9780821830758
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