@article{10_1017_S0017089500007072, author = {Jones, Peter R.}, title = {Basis properties for semigroups}, journal = {Glasgow mathematical journal}, pages = {101--109}, year = {1988}, volume = {30}, number = {1}, doi = {10.1017/S0017089500007072}, url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500007072/} }