Perry, P.A <br/><br/>
Scattering theory by the Enss method 
P.A. Perry 
 - London  Harwood Academic Publishers  1983 
 - xiv  347 
 - Mathematical reports Vol.1, part 1 .
<br/><br/><label>ISBN: </label>3718600935 
<br/><br/><label>Dewey Class. No.: </label>13.04  / PERR