1. Code properties of minimal generating sets of retracts and semiretracts;Anderson;SEA Bull. Math.,1994
2. Semiretracts of a free monoid;Anderson;Theoret. Comput. Sci.,1994
3. J.A. Anderson, Semiretracts of a free monoid (extended abstract), Proc. Colloq. of Words, Languages and Combinatorics II, World Scientific, Singapore, 1994, pp. 1–5.
4. J.A. Anderson, Semiretracts and their Syntactic Monoids, Semigroups: International Conference in Semigroups and its Related Topics, Springer, Berlin, 1998, pp. 1-10.
5. The lattice of semiretracts of a free monoid;Anderson;Internat. J. Comput. Math.,1992