Maslov, V. P. and Nazaikinskii, V. E. <br/><br/>
Asymptotics of operator and pseudo-differential equations   

 - New York  Consultants Bureau  1988 
 - vi, 313p. 
 - Contemporary Soviet Mathematics .
<br/><br/>  
<br/><br/><label>Dewey Class. No.: </label>515.72  / M397.AO