2 citations to https://www.mathnet.ru/eng/emj415
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K. N. Zhuikov, A. Yu. Savin, “Eta-invariant ellipticheskikh kraevykh zadach s parametrom”, SMFN, 69, no. 4, Rossiiskii universitet druzhby narodov, M., 2023, 599–620
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A. Yu. Savin, K. N. Zhuikov, “$\eta$-Invariant for Parameter-Dependent Boundary Value Problems”, Math. Notes, 114:5 (2023), 1079–1083