TY - JOUR AU - Vesselin Petkov AU - Tsviatko Rangelov TI - Leading Singularity of the Scattering Kernel for Moving Obstacles JO - Mathematica balkanica PY - 1990 SP - 91 VL - 4 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MABA_1990_4_1_a9/ ID - MABA_1990_4_1_a9 ER -