%0 Journal Article
%A de Groot, J.
%A Dekker, T.
%T Free subgroups of the orthogonal group
%J Compositio Mathematica
%D 1954-1956
%P 134-136
%V 12
%I Kraus Reprint
%U http://www.numdam.org/item/CM_1954-1956__12__134_0/
%G en
%F CM_1954-1956__12__134_0