Felix Christian
Klein

Universität Göttingen (Physics Tree)


Maxime
Bôcher

Harvard (MathTree)


Enrico
Betti

Università di Pisa (MathTree)


Vito
Volterra

University of Rome (Physics Tree)


Griffith C.
Evans

UC Berkeley (Econometree)


Aristotle Demetrius
Michal

Rice University (Econometree)

Irving S.
Reed

USC
(Options)

Irving ReedX