%0 Journal Article
%A Reese Harvey
%A Frank Morgan
%T The faces of the Grassmanian of three-planes in R7 (Calibrated geometries on R7).
%J Inventiones mathematicae
%D 1986
%P 191-228
%V 83
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM_1986__83_143309/
%F IM_1986__83_143309