TY - GEN AU - Liess,Otto TI - Conical refraction and higher microlocalization T2 - Lecture notes in mathematics SN - 3540571051 (Springer-Verlag Berlin Heidelberg New York) U1 - 510 s515/.353 PY - 1993/// CY - Berlin, New York PB - Springer-Verlag KW - Differential equations, Partial KW - Microlocal analysis KW - Singularities (Mathematics) N1 - Contine bibliogr ER -