Abstract
A part of the proof of Theorem 1 after formula (2.6) should be changed in accordance to page 288 in the book by S. Yakubov and Ya. Yakubov, "Differential-Operator Equations. Ordinary and Partial Differential Equations", Chapman and Hall/CRC, Boca Raton, 2000. Then, one has to change $\frac {m_k}{2}$ to $m_k$ in estimates of all theorems.
Citation
B. A. Aliev. Ya. Yakubov. "Erratum to the paper: "Elliptic differential-operator problems with a spectral parameter in both the equation and boundary-operator conditions"." Adv. Differential Equations 12 (9) 1079 - 1079, 2007. https://doi.org/10.57262/ade/1355867423
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