Geodesic
To the research of the generalised boundary value problem of Valle Poussin for quasidifferential equation of the second order on eigenvalues
Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta, Tome 36 (2006) no. 2, pp. 27-30.

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Theorems related with the connection of spectra of generalised and classical boundary value problems of Valle Poussin are obtained. Representation of generalised problem eigenfunctions by means of classical problem eigenfunctions are found. Examples are given. 
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M. Yu. Vatolkin. To the research of the generalised boundary value problem of Valle Poussin for quasidifferential equation of the second order on eigenvalues. Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta, Tome 36 (2006) no. 2, pp. 27-30. http://geodesic.mathdoc.fr/item/IIMI_2006_36_2_a5/

[1] Derr V. Ya., “K obobschennoi zadache Valle Pussena”, Differentsialnye uravneniya, 23:11 (1987), 1861–1872 | MR

[2] Derr V. Ya., O primenenii kvazidifferentsialnykh uravnenii v teorii lineinykh mnogotochechnykh kraevykh zadach, Dis. ...d-ra fiz.-mat. nauk, Sverdlovsk, 1990

[3] Vatolkin M. Yu., “O sobstvennykh funktsiyakh obobschennoi zadachi Valle Pussena dlya uravneniya vtorogo poryadka”, Tez. dokl., XXXI Nauch–tekhn. konf., V 2 ch. (IzhGTU), v. 2, Izhevsk, 1998, 109–110