Sagan,Hans <br/><br/>
Boundary And Eigenvalue Problems In Mathematical Physics 
Sagan,Hans 
 - New York  Dover  1989 
 - 352  Illustration,index,tables & graph 
<br/><br/><label>ISBN: </label>486661326 
<br/><br/><label>Dewey Class. No.: </label>530.1  / Sa182