Hellwig, Günter,  1926- <br/><br/>
Differential operators of mathematical physics :  an introduction /  Part 1 
Translated from the German by Birgitta Hellwig. 
 - Reading, Mass. :  Addison-Wesley Pub. Co.,  1967. 
 - vii, 296 p. ;  23 cm. 
 - Addison-Wesley series in mathematics .
 - Addison-Wesley series in mathematics .
<br/><br/>Includes index. Bibliography: p. 289-293. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations, Partial.<br/>Hilbert space.<br/>Mathematical physics.
<br/><br/><label>Dewey Class. No.: </label>517.7  / HED 1967