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by Iacob, A.; Pikulin, V. P.; Pohozaev, Stanislav I.
by Korpusov, Maxim Olegovich; Ovchinnikov, Aleksei Vital'evich; Sveshnikov, Alexey Georgievich; et al.
by Bergman, Stefan; Schiffer, Menahem
by Henner ,Victor
by Alexandru Kristály , Vicenţiu D. Rădulescu , Csaba Varga
by Pikulin, Victor P.; Pohozaev, Stanislav I.; Iacob, Andrei
by Carlen, Eric; Harrel, Evans M.; Loss, Michael
by Yichao Zhu
by Pikulin, Victor P.; Pohozaev, Stanislav I.
by HUA, CHEN; Wong, Roderick