TY - JOUR AU - Lallement, G. TI - Some remarks on the four-spiral semigroup. JO - Semigroup forum PY - 1979 VL - 18 SP - 341 EP - 346 KW - four-spiral semigroup; fundamental, idempotent generated bisimple semigroup; Schützenberger representation UR - http://eudml.org/doc/134364 ER -