@article{SF_1971__3_133863,
     author = {B. Tilson},
     title = {Decomposition and complexity of finite semigroups.},
     journal = {Semigroup forum},
     pages = {189--250},
     publisher = {mathdoc},
     volume = {3},
     year = {1971},
     zbl = {0226.20060},
     url = {http://geodesic.mathdoc.fr/item/SF_1971__3_133863/}
}