@article{SF_1975__10_134103,
     author = {B. Tilson and J. Rhodes},
     title = {A reduction theorem for complexity of finite semigroups.},
     journal = {Semigroup forum},
     pages = {96--114},
     publisher = {mathdoc},
     volume = {10},
     year = {1975},
     zbl = {0303.20042},
     url = {http://geodesic.mathdoc.fr/item/SF_1975__10_134103/}
}