Using nonstandard analysis to verify the correctness of computations. Beeson, M. International Journal of Foundations of Computer Science, 6(3):299-338, 1995.  
Pdf  bibtex   @article{beeson1995,
	author = {Michael Beeson},
	date-added = {2014-11-13 23:45:44 +0000},
	date-modified = {2014-11-14 20:05:39 +0000},
	journal = {International Journal of Foundations of Computer Science},
	keywords = {Logic, MathXpert, Nonstandard analysis},
	number = {3},
	pages = {299-338},
	title = {Using nonstandard analysis to verify the correctness of computations},
	url_pdf = {nsappt.pdf},
	volume = {6},
	year = {1995}} 
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