TY  - JOUR
AU  - Robert W. Quackenbush
TI  - Some classes of idempotent functions and their compositions
JO  - Colloquium Mathematicum
PY  - 1974
SP  - 71
EP  - 81
VL  - 29
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm-29-1-71-81/
DO  - 10.4064/cm-29-1-71-81
LA  - en
ID  - 10_4064_cm_29_1_71_81
ER  -