High energy seattering by singular potentials

L. Bertocchi, S. Fubini and G. Furlan:Nuovo Cimento,35, 633 (1965). N. F. Mott and H. S. W. Massey:The Theory of Atomic Collisions (London, 1949), p. 39. E. P. Wigner:Phys. Rev.,98, 145 (1955). F. Calogero:Phys. Rev.,135, B 693 (1964). J. Challifour and R. J. Eden:Journ. Math. Phys.,4, 359 (1963). B. R. Levy and J. B. Keller:Journ. Math. Phys.,4, 54 (1963). L. D. Landau and B. M. Lifshitz:Quantum Mechanics (London, 1958), at p. 416 calculate the contribution to the total cross-seotion from the long-range part of the potential.