TY - BOOK AU - Liess,Otto TI - Conical refraction and higher microlocalization T2 - Lecture notes in mathematics SN - 0387571051 PY - 1993/// CY - Berlin , New York PB - Springer-Verlag KW - Differential equations, Partial KW - Microlocal analysis KW - Singularities (Mathematics) N1 - Includes bibliographical references (p. [380]-385) and index ER -