A. P. Poddubnyak, V. F. Emets, “The current state of the problem of interaction of acoustic beams with obstacles in a deformable medium”, J Math Sci, 62:1 (1992), 2548
М. В. Клибанов, “Об обратных задачах рассеяния и о восстановлении функции по модулю ее преобразования Фурье”, Сиб. матем. журн., 27:5 (1986), 95–109 ; M. V. Klibanov, “Inverse scattering problems and the reconstruction of a function from the modulus of its Fourier transform”, Siberian Math. J., 27:5 (1986), 708–719