The argument principle in a spectral problem for systems of ordinary differential equations with singularities
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 38 (1998) no. 1, pp. 61-67 Cet article a éte moissonné depuis la source Math-Net.Ru

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A. A. Abramov; V. I. Ul'yanova; L. F. Yukhno. The argument principle in a spectral problem for systems of ordinary differential equations with singularities. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 38 (1998) no. 1, pp. 61-67. http://geodesic.mathdoc.fr/item/ZVMMF_1998_38_1_a7/

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