Geodesic
On levels of the Schrëdinger operator with a perturbed step potential
Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, no. 1 (2005), pp. 155-166 
N. I. Pletnikova. On levels of the Schrëdinger operator with a perturbed step potential. Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, no. 1 (2005), pp. 155-166. http://geodesic.mathdoc.fr/item/VUU_2005_1_a10/
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     author = {N. I. Pletnikova},
     title = {On levels of the {Schr\"edinger} operator with a perturbed step potential},
     journal = {Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹ\^uternye nauki},
     pages = {155--166},
     year = {2005},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VUU_2005_1_a10/}
}
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In this paper we investigate resonances and eigenvalues of the Schrëdinger operator with the step potential.