1. J. Łos’,On the categoricity in power of elementary deductive theories, Colloq. Math.3 (1954), 5–62.
2. W. Marsh,On ω 1-categorical but not ω-categorical theories, Doctoral dissertation, Dartmouth College, June, 1966.
3. M. Morley,Categoricity in power, Trans. Amer. Math. Soc.114 (1965), 514–538.
4. M. Morley,A condition equivalent to ℵ 1-categoricity, Notices Amer. Math. Soc.11 (1964), 687.
5. M. Morley and R. L. Vaught,Homogeneous universal models, Math. Scand.11 (1962), 37–57.