1. M. I. Ismailov, “Inverse scattering problem for the nonstationary Dirac equation on the half-plane”, Journal of Inverse and Ill-Posed Problems (2015), (published online).
2. L. P. Nizhnik, Inverse Scattering Problems for Hyperbolic Equations, Nauk, Dumka, Kiev, 1991, (in Russian).
3. M. G. Gasymov, Trudy Moscov. Mat. Obşç. 19, 41–112 (1968), (in Russian);
4. M. G. Gasymov, English trans. Moscow Math. Soc. 19, 41–119 (1968).
5. I. S. Frolov, Soviet Math. Dokl. 13, 1768–4172 (1972);