Wasow, W <br/><br/>
Linear turning point theory 
W. Wasow 
 - New York  Springer  1985 
 - ix  246 
 - Applied mathematical sciences 54 .
<br/><br/><label>ISBN: </label>3540960465 
<br/><br/><label>Dewey Class. No.: </label>10.01+4.04  / WASO