↑ Körner, T. W. (2004). A companion to analysis : a second first and first second course in analysis. Providence, R.I.: American Mathematical Society. ISBN0-8218-3447-9. OCLC 53038515.
Sanders, Sam (2017). "Nonstandard Analysis and Constructivism!". arΧiv:1704.00281 [math.LO].
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