A characterization of internal sets
Rendiconti del Seminario Matematico della Università di Padova, Volume 81 (1989), p. 193-200
@article{RSMUP_1989__81__193_0,
     author = {Tortorelli, V. M.},
     title = {A characterization of internal sets},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {81},
     year = {1989},
     pages = {193-200},
     zbl = {0686.03039},
     mrnumber = {1020193},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1989__81__193_0}
}
Tortorelli, V. M. A characterization of internal sets. Rendiconti del Seminario Matematico della Università di Padova, Volume 81 (1989) pp. 193-200. http://www.numdam.org/item/RSMUP_1989__81__193_0/

[B] M. Boffa, Sur la Théorie des Ensemble sans Axiom de Fondement, Bull. Soc. Mat. Belgique, 21 (1) (1969). | MR 260588 | Zbl 0193.30601

[FH] M. Forti - F. Honsell, Set Theory with Free Construction Principles, Ann. Scuola Norm. Sup. Pisa, Cl. Sc. (1983). | Numdam | MR 739920 | Zbl 0541.03032

[L] W.A.J. Luxembourg, A General Theory of Monads, in Applications of Model Theory to Algebra, Analysis and Probability, W. A. J. LUXEMBUBG Editor, Holt-Rinehart-Winston (1969). | MR 234829 | Zbl 0207.52402

[R] A. Robinson, Non Standard Analysis, North-Holland (1966). | MR 205854 | Zbl 0151.00803

[RZ] A. Robinson - E. Zakon, A Set-Theoretical Characterization of Enlargements, in Applications of Model Theory to Algebra, Analysis and Probability, W. A. J. LUXEMBURG Editor, Holt-Rinehart-Winston (1969). | MR 239965 | Zbl 0193.30301

[T] V.M. Tortorelli, Γ-limiti ed analisi non standard, Tesi di laurea, Pisa (1983).

[Z] E. Zakon, A New Variant of Non-Standard Analysis, Lectures Notes in Math., vol. 369, Springer-Verlag (1970). | MR 476500 | Zbl 0289.02041