Algebraic logic, I. Monadic boolean algebras
Compositio Mathematica, Tome 12 (1954-1956) , pp. 217-249. 
@article{CM_1954-1956__12__217_0,
     author = {Halmos, Paul R.},
     title = {Algebraic logic, I. Monadic boolean algebras},
     journal = {Compositio Mathematica},
     pages = {217--249},
     publisher = {Kraus Reprint},
     volume = {12},
     year = {1954-1956},
     zbl = {0087.24505},
     mrnumber = {78304},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1954-1956__12__217_0/}
}
Halmos, Paul R. Algebraic logic, I. Monadic boolean algebras. Compositio Mathematica, Tome 12 (1954-1956) , pp. 217-249. http://archive.numdam.org/item/CM_1954-1956__12__217_0/

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