Hajnal Andréka, Steven Givant, István Németi. Perfect Extensions and Derived Algebras. Journal of Symbolic Logic, 60(3):775-796, 1995.
@article{AndrekaGN95, title = {Perfect Extensions and Derived Algebras}, author = {Hajnal Andréka and Steven Givant and István Németi}, year = {1995}, tags = { algebra}, researchr = {https://researchr.org/publication/AndrekaGN95}, cites = {0}, citedby = {0}, journal = {Journal of Symbolic Logic}, volume = {60}, number = {3}, pages = {775-796}, }