Lefschetz, S. <br/><br/>
Applications of algebraic topology  graphs and networks the picard-lefschetz theory and feynman integrals 
by S.Lefschetz 
 - New York  Springer Verlag  1975 
 - viii, 189p. 
 - Applied Mathematical Sciences 16 .
<br/><br/><label>ISBN: </label>038790137X 
<br/><br/><label>Dewey Class. No.: </label>514.2  / N75