Article Brigaglia, Aldo; Ciliberto, Ciro (2004)
Remarks on the Relations Between the Italian and American Schools of Algebraic Geometry in the First Decades of the 20th Century. Historia Mathematica (p. 310). (/isis/citation/CBB000470919/) unapi

Article Dahan Dalmedico, Amy (1994)
La renaissance des systèmes dynamiques aux Etats-Unis après la Deuxième Guerre Mondiale: L'action de Solomon Lefschetz. Studies in the History of Modern Mathematics: Supplemento di Rendiconti del Circolo Matematico di Palermo (pp. 133-166). (/isis/citation/CBB000071082/) unapi

Article Griffiths, Philip; Spencer, Donald; Whitehead, George (1992)
Solomon Lefschetz, September 3, 1884--October 5, 1972. Biographical Memoirs of the National Academy of Sciences (pp. 271-313). (/isis/citation/CBB000037325/) unapi

Book Duren, Peter (1988)
A century of mathematics in America. With the assistance of Richard A. Askey, Merzbach, Uta C.. (/isis/citation/CBB000048322/) unapi