%0 Journal Article %A B. G. Averbukh %T Formalization of the notion of a ``number system'' %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1999 %P 254-255 %V 54 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1999_54_1_a10/ %G en %F RM_1999_54_1_a10