Lascar, Richard. <br/><br/>
Propagation des singularites des solutions d'equations pseudo- differentielles a caracteristiques de multiplicities variables / 
Richard Lascar. 
 - Berlin:  Springer-Verlag,  1981. 
 - 237 p.:  ill.;  24 cm. 
 - Lecture notes in mathematics  856. .
<br/><br/>Bibliography:p. 236. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations, Hyperbolic--Numerical solutions.<br/>Pseudodifferential operators.<br/>Singularities (Mathematics).