A. Ya. Kruger

Generalized differentials of nonsmooth functions, and necessary conditions for an extremum

A. Kruger, A. Ya. Kruger, 1985 .

Strict (ε, δ)-Subdifferentials and Extremality Conditions

A. Ya. Kruger, 2002 .

A covering theorem for set-valued mappings

A. Kruger, A. Ya. Kruger, 1988 .