S. Lefschetz: Intersections and transformations of complexes and manifolds, Transactions American Mathematical Society 1926, Bd. 28, S. 1–49 (Online; PDF; 4,3 MB)
pnas.org
Heinz Hopf: A new proof of the Lefschetz formula on invariant points, Proceedings of the National Academy of Sciences of the USA, Bd. 14 (1928), S. 149–153 (Online; PDF; 421 kB)
