Literature Cited
H. J. Keisler, Ultraproducts and Elementary Classes, Indagation Math.,23 (1961).
H. J. Keisler, Ultraproducts and Saturated Models, Indagation Math.,26 (1964).
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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 9, No. 1, pp. 216–219, January–February, 1968.
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Omarov, A.I. M(a)-class of models. Soviet Mathematical Journal 9, 163–165 (1968). https://doi.org/10.1007/BF02196672
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DOI: https://doi.org/10.1007/BF02196672