%0 Journal Article %A Karel Hrbacek %T Axiomatic foundations for Nonstandard Analysis %J Fundamenta Mathematicae %D 1978 %P 1-19 %V 98 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-98-1-1-19/ %R 10.4064/fm-98-1-1-19 %G en %F 10_4064_fm_98_1_1_19