Kadelburg, Eh.; Martinović, M. The spectral function of a second order functional-differential operator. (Russian) Zbl 0693.34070 Differ. Uravn. 25, No. 11, 1882-1888 (1989). The paper deals with the asymptotic behavior of the spectral function corresponding to the boundary value problem \[ -u''(x)+q(x)u(x)+\sum^{n- 1}_{k=1}\alpha_ ku(x_ k)=0,\quad u(0)=u(1)=0, \] where \(\alpha_ k\) are given complex numbers and \(x_ k=k\pi /n\) \((k=1,2,...,n-1)\). In particular, the dependence of the spectral function on the coefficient q(x) is studied. Reviewer: M.Tvrdy Cited in 1 ReviewCited in 1 Document MSC: 34K10 Boundary value problems for functional-differential equations 34L99 Ordinary differential operators Keywords:second order differential equation; Sturm-Liouville operator; differential-boundary operator; spectral function PDFBibTeX XMLCite \textit{Eh. Kadelburg} and \textit{M. Martinović}, Differ. Uravn. 25, No. 11, 1882--1888 (1989; Zbl 0693.34070)