Geodesic
On eigenfunctions of an operator corresponding to the poles of the analytic continuation of the resolvent through the continuous spectrum
Sbornik. Mathematics, Tome 16 (1972) no. 2, pp. 307-322 Cet article a éte moissonné depuis la source Math-Net.Ru

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It is well known that the kernel of the resolvent of the operator $-\Delta+q(x)$ ($q(x)$ finite) over the whole space, or over the exterior of a bounded domain with homogeneity conditions on the boundary, can be meromorphically continued through the continuous spectrum onto the second sheet of a two-sheeted Riemann surface. The poles of this continuation lying in the second sheet correspond to generalized eigen and associated functions exponentially increasing at infinity. In this paper we study the problem of orthogonality of these functions. In addition the problem of which generalized eigenfunctions are the usual eigenfunctions is mentioned. Bibliography: 8 titles. 
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B. R. Vainberg. On eigenfunctions of an operator corresponding to the poles of the analytic continuation of the resolvent through the continuous spectrum. Sbornik. Mathematics, Tome 16 (1972) no. 2, pp. 307-322. http://geodesic.mathdoc.fr/item/SM_1972_16_2_a10/

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