Sneddon, Ian N <br/><br/>
Elements of partial differential equations 

 - 1st 
 - Auckland  McGraw-Hill  1957 
 - ix,327p p. 
<br/><br/><label>ISBN: </label>0-07-085740-7 
<br/><br/><label>Subjects--Index Terms: </label>Differential equations, Partial