(1)
Zubkova, E. I.; Rofe-Beketov, F. S. Inverse Scattering Problem on the Axis for the Schrödinger Operator with Triangular 2 x 2 Matrix Potential. II. Addition of the Discrete Spectrum. Журн. мат. фіз. анал. геом. 2007, 3, 176-195.