A Bogolyubov-Type Theorem with a Nonconvex Constraint in Banach Spaces. - F. S. De Blasi; Giulio Pianigiani; A. A. Tolstonogov (SIAM J. Control. Optim., 2004)

On the Arrow-Hahn utility representation method. - Michele Gori; Giulio Pianigiani (Math. Soc. Sci., 2010)