%0 Journal Article
%A Folke Eriksson
%T The Relation Between Two Generalisations of the Notion 
%J Mathematica Scandinavica
%D 1960
%P 339-355
%V 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MS2_1960__8_165756/
%F MS2_1960__8_165756