Geodesic
Analytic structure of the $S$ matrix for some classes of potentials
Teoretičeskaâ i matematičeskaâ fizika, Tome 31 (1977) no. 2, pp. 214-219

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Using the properties of the Jost functions and their generalisations introduced in this article, mathematical properties and singularities of $S$-matrix of the elastic scattering are studied for local hard-core, non-local separable, complex local and non-local separable hard-core potentials. 
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     author = {M. V. Nikolaev and V. S. Ol'khovskii},
     title = {Analytic structure of the $S$ matrix for some classes of potentials},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {214--219},
     publisher = {mathdoc},
     volume = {31},
     number = {2},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1977_31_2_a6/}
}
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M. V. Nikolaev; V. S. Ol'khovskii. Analytic structure of the $S$ matrix for some classes of potentials. Teoretičeskaâ i matematičeskaâ fizika, Tome 31 (1977) no. 2, pp. 214-219. http://geodesic.mathdoc.fr/item/TMF_1977_31_2_a6/