TY  - JOUR
AU  - Reese Harvey
AU  - Frank Morgan
TI  - The faces of the Grassmanian of three-planes in R7 (Calibrated geometries on R7).
JO  - Inventiones mathematicae
PY  - 1986
SP  - 191
EP  - 228
VL  - 83
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1986__83_143309/
ID  - IM_1986__83_143309
ER  -