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Samoilenko, A.M., Berezovskii, A.A. & Lenyuk, M.P. School-Seminar “Nonlinear boundary-value problems in Mathematical Physics and their applications”. Ukr Math J 48, 973–975 (1996). https://doi.org/10.1007/BF02384184
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DOI: https://doi.org/10.1007/BF02384184