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An Effective Conservation Result for Nonstandard Arithmetic
Mathematical Logic Quarterly, 2000exaly
Definable sets and expansions of models of Peano arithmetic
Archive for Mathematical Logic, 1988exaly
A nonstandard numerical scheme of predictor–corrector type for epidemic models
Computers and Mathematics With Applications, 2010Abraham Jose Arenas Tawil +1 more
exaly
Normal subgroups of nonstandard symmetric and alternating groups
Archive for Mathematical Logic, 2007exaly
Transfer principles in nonstandard intuitionistic arithmetic
Archive for Mathematical Logic, 2002exaly