Geodesic
The asymptotic behaviour of levels of the one-dimensional Schr\"odinger operator with the non-local potential
Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta, Tome 31 (2005) no. 1, pp. 99-106.

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We investigate the one-dimensional Schrödinger operator with the potential that is the sum of $n$ separable potentials. There are $n$ levels (eigenvalues or resonances) of this Schrödinger operator. We study the asymptotic behaviour of levels in the case $n=2$. 
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M. S. Smetanina. The asymptotic behaviour of levels of the one-dimensional Schr\"odinger operator with the non-local potential. Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta, Tome 31 (2005) no. 1, pp. 99-106. http://geodesic.mathdoc.fr/item/IIMI_2005_31_1_a2/

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[2] Smetanina M. S., “Ob uravnenii Shredingera s nelokalnym potentsialom”, Izvestiya Instituta matematiki i informatiki UdGU. Izhevsk, 2002, no. 3(26), 99–114

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