Shyr, H.J.. "Every subsemigroup of a free semigroup with zero is not an R-semigroup.." Semigroup forum 12 (1976): 380-382. <http://eudml.org/doc/134189>.
@article{Shyr1976, author = {Shyr, H.J.}, journal = {Semigroup forum}, pages = {380-382}, title = {Every subsemigroup of a free semigroup with zero is not an R-semigroup.}, url = {http://eudml.org/doc/134189}, volume = {12}, year = {1976}, }
TY - JOUR AU - Shyr, H.J. TI - Every subsemigroup of a free semigroup with zero is not an R-semigroup. JO - Semigroup forum PY - 1976 VL - 12 SP - 380 EP - 382 UR - http://eudml.org/doc/134189 ER -
