TY - JOUR AU - Popivanov, Nedyu AU - Hristov, Tsvetan TI - The Darboux Problem for a Class of 3-D Weakly Hyperbolic Equations JO - Mathematics and Education in Mathematics PY - 2011 SP - 193 EP - 199 VL - 40 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MEM_2011_40_1_a17/ LA - en ID - MEM_2011_40_1_a17 ER -