TY - JOUR AU - Rupert, C. P. TI - Crossability of cancellative Kleene semigroups JO - RAIRO. Informatique théorique et applications PY - 1992 SP - 151 EP - 161 VL - 26 IS - 2 PB - EDP-Sciences UR - https://www.numdam.org/item/ITA_1992__26_2_151_0/ LA - en ID - ITA_1992__26_2_151_0 ER -