Liess, O <br/><br/>
Conical refraction & higher microlocalization 
O. Liess 
 - Berlin  Springer  1993 
 - x  389 
 - Lecture notes in mathematics 1555 .
<br/><br/><label>ISBN: </label>3540571051 
<br/><br/><label>Dewey Class. No.: </label>10.07+4.12+5.03+22  / LIES