@article{SF_1979__18_134337,
     author = {Y. Tirasupa},
     title = {The factorizable transformation semigroups.},
     journal = {Semigroup forum},
     pages = {15--20},
     publisher = {mathdoc},
     volume = {18},
     year = {1979},
     zbl = {0416.20054},
     url = {http://geodesic.mathdoc.fr/item/SF_1979__18_134337/}
}