1. C. Ward Henson and Frank Wattenberg, “Egoroff’s theorem and the distribution of standard points in a nonstandard model”, Proc. Amer. Math. Soc., 81 (1981) 455–461.
2. Studies in Logic and Found. Math.;W. A. J. Luxemburg,1972
3. David A. Ross, Nonstandard measure constructions — solutions and problems, in Nonstandard methods and applications in mathematics, Lecture Notes in Logic, 25, A.K. Peters, 2006.
4. NATO Adv. Sci. Inst. Ser. C. Math. Phys. Sci.;D. A. Ross,1997
5. Cambridge Mathematical Textbooks;D. Williams,1991