On analytic solutions to the generalized Cauchy problem with data on three surfaces for a quasilinear system. Kazakov, A.L. — 2006 Sibirskij Matematicheskij Zhurnal
The generalized Cauchy problem with data on two surfaces for a quasilinear analytic system. Kazakov, A.L. — 2007 Sibirskij Matematicheskij Zhurnal