John, Fritz. <br/><br/>
Plane waves and spherical means : applied to partial differential equations /  
by Fritz John. 
 - /   . 
 - N Y :   Dover Publications ,   2004. 
 - 172p. :   ills. ;   22cm .  
<br/><br/>Includes index 
<br/><br/><label>ISBN: </label>048643804X  USD12.95 
<br/><br/><label>Subjects--Index Terms: </label>DIFFERENTIAL EQUATIONS 
<br/><br/><label>Dewey Class. No.: </label>515.353  / JOH/P