Samuel Eilenberg. Classes of Semigroups and Classes of Sets. In Conference Record of Fifth Annual ACM Symposium on Theory of Computing, 30 April-2 May 1973, Austin, Texas, USA. pages 266-267, ACM, 1973.
@inproceedings{Eilenberg73, title = {Classes of Semigroups and Classes of Sets}, author = {Samuel Eilenberg}, year = {1973}, researchr = {https://researchr.org/publication/Eilenberg73}, cites = {0}, citedby = {0}, pages = {266-267}, booktitle = {Conference Record of Fifth Annual ACM Symposium on Theory of Computing, 30 April-2 May 1973, Austin, Texas, USA}, publisher = {ACM}, }