@article{SF_1974__6_133973,
     author = {M. Yamada},
     title = {Note on a certain class of orthodox semigroups.},
     journal = {Semigroup forum},
     pages = {180--188},
     publisher = {mathdoc},
     volume = {6},
     year = {1974},
     zbl = {0255.20040},
     url = {http://geodesic.mathdoc.fr/item/SF_1974__6_133973/}
}