TARASOV, V. G.; NIZHNIK, L. P. Direct and inverse scattering problems for multidimensional system of first-order partial differential equations. Methods of Functional Analysis and Topology, [S. l.], v. 5, n. 2, p. 44–82, 1999. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/89. Acesso em: 17 dec. 2025.