Proceedings of the National Academy of Sciences of the United States of America
Maharam's theorem about the decomposability of complete measure spaces plays an important role in the theory of Banach spaces. Maharam published it in the "Proceedings of the National Academy of Sciences of the United States of America" in 1942. Another paper of Maharam, in 1947 in the "Annals of Mathematics", introduced Maharam algebras, which are complete Boolean algebras with continuous submeasures.