@book{Kru77.2,
author = {Kruger, A. Y.},
title = {Subdifferentials of nonconvex functions and generalized directional derivatives},
publisher = {},
series = {Deposited in VINITI no.~2661-77},
year = {1977},
address = {Minsk},
note = {in Russian}
}

@article {MorKru78,
AUTHOR = {Mordukhovich, B. Sh. and Kruger, A. Ya.},
TITLE = {Minimization of nonsmooth functionals in optimal control problems},
JOURNAL = {Izvestia Akad. Nauk SSSR. Tech. Kybernetyka},
FJOURNAL = {},
year = {1978},
NUMBER = {4},
PAGES = {176--182},
note = {(In Russian; English transl.: Engrg. Cybernetics 16 (1978), no. 4, 126--133)}
}

@book{KruMor80.1,
author = {Kruger, A. Y. and Mordukhovich, B. S.},
title = {Generalized normals and derivatives and necessary conditions for an extremum in problems of nondifferentiable programming},
publisher = {},
series = {Deposited in VINITI, I -- no.~408-80, II -- no.~494-80},
year = {1980},
address = {Minsk},
note = {in Russian} }

@article{KruMor80.3,
author = {Kruger, A. Y. and Mordukhovich, B. S.},
title = {Extremal points and the {E}uler equation in nonsmooth optimization},
journal = {Dokl. Akad. Nauk BSSR},
volume = {24},
number = {8},
year = {1980},
pages = {684--687},
note = {in Russian}
}

@book{Kru81.1,
author = {Kruger, A. Y.},
title = {$\varepsilon$-semidifferentials and $\varepsilon$-normal elements},
publisher = {},
series = {Deposited in VINITI no.~1331-81},
year = {1981},
address = {Minsk},
note = {in Russian}
}

@book{Kru81.2,
author = {Kruger, A. Y.},
title = {Generalized differentials of nonsmooth functions},
publisher = {}, series = {Deposited in VINITI no.~1332-81},
year = {1981},
address = {Minsk},
note = {in Russian}
}

@book{Kru81.3,
author = {Kruger, A. Y.},
title = {Necessary conditions of an extremum in problems of nonsmooth optimization},
publisher = {},
series = {Deposited in VINITI no.~1333-81},
year = {1981},
address = {Minsk},
note = {in Russian}
}

@article{Kru85.1,
author = {Kruger, A. Y.},
title = {Generalized differentials of nonsmooth functions and necessary conditions for an extremum},
journal = {Sibirskii Matem. Zh.},
volume = {26},
NUMBER = {3},
year = {1985},
pages = {78--90},
note = {(In Russian; English transl.: Siberian Math. J. 26 (1978), 370--379)}
}

@article{Kru85.2,
author = {Kruger, A. Y.},
title = {Properties of generalized differentials},
journal = {Sibirskii Matem. Zh.},
volume = {26},
NUMBER = {6},
year = {1985},
pages = {54--66},
note = {(In Russian; English transl.: Siberian Math. J. 26 (1978), 822--832)}
}

@book{Kru85.3,
author = {Kruger, A. Y.},
title = {Covering theorem for set-valued mappings},
publisher = {},
series = {Deposited in VINITI no.~4613-85},
year = {1985},
address = {Minsk},
note = {in Russian}
}

@article{Kru88,
author = {Kruger, A. Y.},
title = {Covering theorem for set-valued mappings},
journal = {Optimization},
volume = {19},
year = {1988},
pages = {763--780},
note = {}
}

@article{Kru96.1,
author = {Kruger, A. Y.},
title = {On calculus of strict $\varepsilon$-semidifferentials},
journal = {Dokl. Akad. Nauk Belarus},
volume = {40},
number = {4},
year = {1996},
pages = {34--39},
note = {in Russian}
}

@article{Kru96.2,
author = {Kruger, A. Y.},
title = {Strict $\varepsilon$-semidifferentials and differentiating set-valued map\-pings},
journal = {Dokl. Akad. Nauk Belarus},
volume = {40},
number = {6},
year = {1996},
pages = {38--43},
note = {in Russian}
}

@article{Kru97,
author = {Kruger, A. Y.},
title = {Strict $\varepsilon$-semidifferentials and extremality conditions},
journal = {Dokl. Akad. Nauk Belarus},
volume = {41},
number = {3},
year = {1997},
pages = {21--26},
note = {in Russian}
}

@article{Kru98.1,
author = {Kruger, A. Y.},
title = {On extremality of sets systems},
journal = {Dokl. Nat. Akad. Nauk Belarus},
volume = {42},
number = {1},
year = {1998},
pages = {24--28},
note = {in Russian}
}

@incollection{Kru98.3,
author = {Kruger, A. Y.},
title = {On necessary and sufficient extremality conditions},
booktitle = {Dynamical Systems: Stability, Control, Optimization/ September 28 -- October 4, 1998, Minsk, Belarus, Vol. 2},
publisher = {Institute of Mathematics of National Academy of Sciences of Belarus},
year = {1998},
editor = {I. V. Gaishun},
address = {Minsk},
pages = {165-168}
}

@article{Kru00.1,
author = {Kruger, A. Y.},
title = {Strict ($\varepsilon,\delta$)-se\-mi\-differentials and extremality of sets and functions},
journal = {Dokl. Nat. Akad. Nauk Belarus},
volume = {44},
number = {4},
year = {2000},
pages = {21--24},
note = {in Russian}
}

@article{Kru02.1,
author = {Kruger, A. Y.},
title = {Strict ($\varepsilon,\delta$)-se\-mi\-differentials and extremality conditions},
journal = {Optimization},
volume = {51},
no = {3},
year = {2002},
pages = {539--554},
note = {}
}

@article{Kru03.1,
author = {Kruger, A. Y.},
title = {On {F}r\'echet subdifferentials},
journal = {J. Math. Sci.},
volume = {116},
no = {3},
year = {2003},
pages = {3325--3358},
note = {}
}

@article{Kru04.1,
author = {Kruger, A. Y.},
title = {Weak stationarity: eliminating the gap between necessary and sufficient conditions},
journal = {Optimization},
volume = {53},
no = {2},
year = {2004},
pages = {147--164},
note = {}
}

@article{Kru05.1,
author = {Kruger, A. Y.},
title = {Stationarity and regularity of set systems},
journal = {Pacif. J. Optimiz.},
volume = {1},
no = {1},
year = {2005},
pages = {101--126},
note = {}
}