@article{SF_1976__13_134210,
     author = {J.W. Nichols},
     title = {A class of maximal inverse subsemigroups of {TX.}},
     journal = {Semigroup forum},
     pages = {187--188},
     year = {1976},
     volume = {13},
     zbl = {0359.20048},
     url = {http://geodesic.mathdoc.fr/item/SF_1976__13_134210/}
}