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@article{MS2_1970__27_166146, author = {Donald Monk}, title = {On {Equational} {Classes} of {Algebraic} {Versions} of {Logic} {I.}}, journal = {Mathematica Scandinavica}, pages = {53--71}, publisher = {mathdoc}, volume = {27}, year = {1970}, zbl = {0208.01202}, url = {http://geodesic.mathdoc.fr/item/MS2_1970__27_166146/} }
Donald Monk. On Equational Classes of Algebraic Versions of Logic I.. Mathematica Scandinavica, Tome 27 (1970), pp. 53-71. http://geodesic.mathdoc.fr/item/MS2_1970__27_166146/