1. Nonstandard Methods In Stochastic Analysis and Mathematical Physics;Albeverio,1986
2. Logic and Necessity;Carnap,1947
3. The metamathematics of probability;Drossos,1983
4. C.A. Drossos, Foundations of nonstandard mathematics: infinitesimals, Boolean analysis and categories, lecture notes (in Greek).
5. Foundations of fuzzy sets: a nonstandard approach;Drossos;Fuzzy Sets and Systems,1990