\Bibitem{Kad81} \by Z.~Kadelburg \paper Asymptotic of ``the spectral functions'' of two non-self-adjoint boundary-value problems \jour Mat. Zametki \yr 1981 \vol 30 \issue 5 \pages 659--667 \mathnet{http://mi.mathnet.ru/mzm10058} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=640065} \zmath{https://zbmath.org/?q=an:0497.34022} \transl \jour Math. Notes \yr 1981 \vol 30 \issue 5 \pages 827--831 \crossref{https://doi.org/10.1007/BF01140214}