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 
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/
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     title = {Principal singularities of the $S$ matrix for a~system of one-dimensional particles},
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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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