%0 Journal Article %A V. A. Lyubetskii %T Valuations and sheaves. On some questions of non-standard analysis %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1989 %P 37-112 %V 44 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1989_44_4_a2/ %G en %F RM_1989_44_4_a2