Geodesic
Principal singularities of the $S$ matrix for a~system of one-dimensional particles
Teoretičeskaâ i matematičeskaâ fizika, Tome 70 (1987) no. 2, pp. 266-277

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Explicit expressions are obtained for principal singularities of the scattering matrix in one-dimensional particles system described by the Hamiltonian $\Delta /2 +\sum v(x_i-$ $-x_j)$. The conditions are found under which the principal singularities are free from diffraction effects. 
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     author = {V. S. Buslaev and N. A. Kaliteevskii},
     title = {Principal singularities of the $S$ matrix for a~system of one-dimensional particles},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {266--277},
     publisher = {mathdoc},
     volume = {70},
     number = {2},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1987_70_2_a10/}
}
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V. S. Buslaev; N. A. Kaliteevskii. Principal singularities of the $S$ matrix for a~system of one-dimensional particles. Teoretičeskaâ i matematičeskaâ fizika, Tome 70 (1987) no. 2, pp. 266-277. http://geodesic.mathdoc.fr/item/TMF_1987_70_2_a10/