Eilenberg Theorems for Free - Urbat, Henning; Adámek, Jiří; Chen, Liang-Ting; Milius, Stefan (Proc. 42nd International Symposium on Mathematical Foundations of Computer Science (MFCS 2017), 2017)
Keywords: Duality; Eilenberg's theorem; Monad; Pseudovariety; Variety of languages