Elsevier B.V.
doi.org/10.1016/j.entcs.2013.09.005
Electronic Notes in Theoretical Computer Science
Conference on the Mathematical Foundations of Programming Semantics
Computer Security

Rutten, J., Ballester-Bolinches, A.& Cosme-Llopez, E. (2013). Varieties and covarieties of languages (preliminary version). Proceedings of Conference on the Mathematical Foundations of Programming Semantics 2013 (MFPS 0), 7–28.https://doi.org/10.1016/j.entcs.2013.09.005