One-to one Carathéodory representation theorem for multifunctions with uncountable values A. Ioffe — 1980 Fundamenta Mathematicae
On necessary conditions in variable end-time optimal control problems A. Ioffe — 2005 Control and Cybernetics
Generic well-posedness in minimization problems. Ioffe, A.; Lucchetti, R.E. — 2005 Abstract and Applied Analysis