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- 83(6):1165–1198. Robert, Alain (1985). Nonstandard analysis. John Wiley & Sons. ISBN 0-471-91703-6. Internal Set Theory, a chapter of an unfinished book by Nelson....14 KB (2,325 words) - 17:31, 3 March 2022
432–440. Robert, A. Nonstandard analysis, Wiley, New York 1988. ISBN 0-471-91703-6 Skolem, Th. (1934) "Über die Nicht-charakterisierbarkeit der Zahlenreihe...31 KB (4,051 words) - 21:44, 3 April 2024
