@article{GDZPPN001250523,
title = {A reduction theorem for complexity of finite semigroups.},
journal = {Semigroup forum},
volume = {11},
year = {1975},
pages = {96-114},
zbl = {0303.20042},
url = {http://dml.mathdoc.fr/item/GDZPPN001250523}
}
Tilson, B.; Rhodes, J. A reduction theorem for complexity of finite semigroups.. Semigroup forum, Tome 11 (1975) pp. 96-114. http://gdmltest.u-ga.fr/item/GDZPPN001250523/