References
Ildikó Sain
with Mikulás, S. , András, S. (2015). Complexity of equational theory of relational algebras with standard projection elements. Synthese 192 (7), pp. 2159-2182.
with Mikulás, S. , András, S. (2015). Complexity of equational theory of relational algebras with standard projection elements. Synthese 192 (7), pp. 2159-2182.