Nizhnik LP, Tarasov VG. Scattering problem for a multidimensional system of first-order partial differential equations. Ukr. Mat. Zhurn. [Internet]. 1999Aug.25 [cited 2024May9];51(8):1065–1076. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4697