Spectra of partial differential operators 
Schechter, Martin. 
 - 2nd ed. 
 - Amsterdam ; | New York : | New York, N.Y., U.S.A. :  North-Holland ; | Sole distributors for the U.S.A. and Canada, Elsevier Science Pub. Co.,  1986 
 - xiii, 310 p. ;  23 cm. 
 - North-Holland series in applied mathematics and mechanics ;  v. 14 .
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>044487822X (U.S.)