... USA, 1975.3 V. A. Marchenko, Sturm-Liouville Operators and Applications, vol. 22 of Operator Theory: Advances and Applications,Birkh¨auser, Basel, Switzerland, 1986.4 M. A. Naimark, Linear ... R. Mamedov and H. Menken, “Asymptotic formulas for eigenvalues and eigenfunctions of a nonselfadjoint Sturm-Liouville operator,” in Further Progress in Analysis,H.G.W.Begehr ,A. O.C¸elebi, and ... 21 pagesdoi:10.1155/2010/720235Research ArticleAccurate Asymptotic Formulas for Eigenvalues and Eigenfunctions of a Boundary-Value Problem of Fourth OrderHamza MenkenMathematics Department,...