Lefschetz, S. (1975). Applications of algebraic topology: Graphs and networks: the Picard-Lefschetz theory and Feynman integrals. New York: Springer-Verlag.
Παραπομπή Chicago StyleLefschetz, Solomon. Applications of Algebraic Topology: Graphs and Networks: The Picard-Lefschetz Theory and Feynman Integrals. New York: Springer-Verlag, 1975.
Παραπομπή MLALefschetz, Solomon. Applications of Algebraic Topology: Graphs and Networks: The Picard-Lefschetz Theory and Feynman Integrals. New York: Springer-Verlag, 1975.
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