Eklof, Paul C.; Fischer, Edward R. (1972), «The elementary theory of abelian groups», Annals of Pure and Applied Logic, 4: 115–171, doi:10.1016/0003-4843(72)90013-7, MR0540003.
Eklof, Paul C.; Fischer, Edward R. (1972), «The elementary theory of abelian groups», Annals of Pure and Applied Logic, 4: 115–171, doi:10.1016/0003-4843(72)90013-7, MR0540003.