1. Operators of Sturm-Liouville and Their Applications;Marchenko,1977
2. Theory of Solitons. Method of Inverse Problem;Zaharov,1980
3. Theory of Non-linear Lattices;Toda,1981
4. Inverse Problems of Sturm-Liouville;Levitan,1984
5. Three integrable Hamiltonian systems connected with isospectral deformations