@article{GDZPPN002485338,
title = {Naturally Orderd Transformation Semigroups.},
journal = {Monatshefte f\"ur Mathematik},
volume = {102},
year = {1986},
pages = {115-138},
zbl = {0594.20062},
url = {http://dml.mathdoc.fr/item/GDZPPN002485338}
}
Kowol, G.; Mitsch, H. Naturally Orderd Transformation Semigroups.. Monatshefte für Mathematik, Tome 102 (1986) pp. 115-138. http://gdmltest.u-ga.fr/item/GDZPPN002485338/