Hellwig, Günter. <br/><br/>
Partial differential equations. 

 - Primera Edición 
 - New York-Estados Unidos:  Blaisdell Publishing Company,  1964. 
 - 255 páginas.  Figuras y ejercicios.  26 cm. 
<br/><br/>Examples. Classification into types, theory of characteristics, and normal form. Questions of Uniqueness. Questions of existence. Simple tools from functional analysis applied to questions of existence. 
<br/><br/><br/>En inglés. 
<br/><br/><label>Subjects--Index Terms: </label>Partial differential equations. 
<br/><br/><label>Dewey Class. No.: </label>515.35  / H476