TY  - JOUR
AU  - Carlton J. Maxson
TI  - Semigroups of order-preserving partial endomorphisms on trees, I
JO  - Colloquium Mathematicum
PY  - 1974
SP  - 25
EP  - 37
VL  - 32
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm-32-1-25-37/
DO  - 10.4064/cm-32-1-25-37
LA  - en
ID  - 10_4064_cm_32_1_25_37
ER  -