Lanczos, Cornelius <br/><br/>
Linear differential operators 

 - Philadelphia  Siam  1996 
 - xvii  564p.  24 cm. PB 
 - Classics in applied mathematics .
<br/><br/><label>ISBN: </label>0898713706 
<br/><br/><label>Dewey Class. No.: </label>515.7242  / LAN