TY  - JOUR
AU  - Wulf Rehder
TI  - On the commutativity of two projections.
JO  - Elemente der Mathematik
PY  - 1980
SP  - 120
EP  - 122
VL  - 35
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ELMA_1980__35_141250/
ID  - ELMA_1980__35_141250
ER  -