TY - BOOK AU - Bellman, Richard AU - Vasudevan, Ramabhadra TI - Wave propagation: an invariant imbedding approach T2 - Mathematics and its applications SN - 9027717664 U1 - 530.124 PY - 1986/// CY - Boston PB - D. Reidel KW - Wave equation KW - Numerical solutions ER -