Lefschetz.S <br/><br/>
Applications of Algebraic Topology  Graphs and Networks The Picard-Lefschetz Theory and feynman Integrals 
/ by S.Lefschetz 
 - New York  Springer  1975 
 - 189p. 
<br/><br/><label>ISBN: </label>038790137 
<br/><br/><label>Dewey Class. No.: </label>514.2  / LEF/A