Geodesic
Energy levels of an oscillator with singular concentrated potential
Teoretičeskaâ i matematičeskaâ fizika, Tome 46 (1981) no. 3, pp. 321-324

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The algebra of generalized functions constructed earlier by Shirokov is used to solve the Schrödinger equation for a harmonic oscillator on which a singular concentrated potential acts. The small corrections to the energy levels due to this potential are obtained. 
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     author = {O. G. Goryaga and Yu. M. Shirokov},
     title = {Energy levels of an oscillator with singular concentrated potential},
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     year = {1981},
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O. G. Goryaga; Yu. M. Shirokov. Energy levels of an oscillator with singular concentrated potential. Teoretičeskaâ i matematičeskaâ fizika, Tome 46 (1981) no. 3, pp. 321-324. http://geodesic.mathdoc.fr/item/TMF_1981_46_3_a5/