Bibliography
Hanf, W. 1974. “Primitive Boolean Algebras.” in Proceedings of the Tarski Symposium. An International Symposium Held to Honor Alfred Tarski on the Occasion of his Seventieth Birthday, edited by Arend Heyting, pp. 75–90. Proceedings of Symposia in Pure Mathematics n. 25. Providence, Rhode Island: American Mathematical Society. Held at the University of California, Berkeley, June 23-30, 1971.