TY  - JOUR
AU  - K.D. jr. Magill
AU  - B.B. Baird
TI  - Green's ...-relation and climbing mountains.
JO  - Semigroup forum
PY  - 1979
SP  - 347
EP  - 370
VL  - 18
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1979__18_134365/
ID  - SF_1979__18_134365
ER  -