@article{MOMA_1986__102_178293,
     author = {G. Kowol and H. Mitsch},
     title = {Naturally {Orderd} {Transformation} {Semigroups.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {115--138},
     publisher = {mathdoc},
     volume = {102},
     year = {1986},
     zbl = {0594.20062},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1986__102_178293/}
}