Geodesic
Determination of closed expressions for the perturbation theory corrections to the wave functions of bound states by means of a Sturm function expansion
Teoretičeskaâ i matematičeskaâ fizika, Tome 21 (1974) no. 2, pp. 224-232 
A. I. Sherstyuk. Determination of closed expressions for the perturbation theory corrections to the wave functions of bound states by means of a Sturm function expansion. Teoretičeskaâ i matematičeskaâ fizika, Tome 21 (1974) no. 2, pp. 224-232. http://geodesic.mathdoc.fr/item/TMF_1974_21_2_a7/
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     title = {Determination of closed expressions for the perturbation theory corrections to the wave functions of bound states by means of {a~Sturm} function expansion},
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Voir la notice de l'article provenant de la source Math-Net.Ru

By summation of expansions with respect to a complete system of eigenfunctions of a Sturm–Liouville type operatorwith only a discrete spectrum, closed expressions are obtained for the first- and second-order perturbation corrections to the wave function of an arbitrary bound state of an electron in a Coulomb field in the presence of a centrally symmetric perturbing potential.

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