%0 Journal Article
%A Loonstra, F.
%T The classes of partially ordered groups
%J Compositio Mathematica
%D 1951
%P 130-140
%V 9
%I Kraus Reprint
%U http://www.numdam.org/item/CM_1951__9__130_0/
%G en
%F CM_1951__9__130_0