1. Z. S. Agranovich and V. A. Marchenko, The Inverse Scattering Problem [in Russian], Khar'kov State University (1960);
2. K. Chadan and P. C. Sabatier, Inverse Problems in Quantum Scattering Theory, Springer, Berlin (1977).
3. L. D. Faddeev, Usp. Mat. Nauk,14, 57 (1959).
4. R. G. Newton, ?The Marchenko and Gelfand-Levitan methods in the inverse scattering problem in one and three dimensions?, Proc. Conf. Inverse Scattering: Theory and Application, SIAM, Philadelphia (1984).
5. V. E. Zakharov, S. V. Manakov, S. P. Novikov, and L. P. Pitaevskii, The Theory of Solitons: The Inverse Scattering Method [in Russian], Nauka, Moscow (1980).