Lefschetz, S <br/><br/>
Applications of algebraic topology  graphs & networks:the picard-lefschetz theory & feynman integrals 
S. Lefschetz 
 - New York  Springer  1975 
 - viii  189 
 - Applied mathematical sciences 16 .
<br/><br/><label>ISBN: </label>354090137x 
<br/><br/><label>Dewey Class. No.: </label>7.02  / LEFS