TY - JOUR AU - K. K. Lavrent'ev TI - Inverse problems of the finding boundary condition in the theory of propagation of nonstationary waves.~II JO - Zapiski Nauchnykh Seminarov POMI PY - 1975 SP - 129 EP - 133 VL - 51 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ZNSL_1975_51_a7/ LA - ru ID - ZNSL_1975_51_a7 ER -