1. A. Robinson, Non-Standard Analysis, North-Holland, Amsterdam (1966).
2. M. Davis, Applied Nonstandard Analysis [Russian translation], Mir, Moscow (1980).
3. S. Albeverio, J. F. Fenstad, R. J. Höegh-Krohn, and T. L. Lindström, Nonstandard Methods in Stochastic Analysis and Mathematical Physics [Russian translation], Mir, Moscow (1990).
4. A. G. Kusraev and S. S. Kutateladze, Nonstandard Methods of Analysis [in Russian], Nauka, Novosibirsk (1990).
5. H. Attouch, Variational Convergence for Functions and Operators, Pitman, Boston etc. (1984).