Geodesic
On compact classes of models
Algebra i logika, Tome 6 (1967) no. 2, pp. 49-60.

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The main result of this paper is Theorem 2, which is a generalization of Makkai [8]. The proof of our results used the notion of ultraproducts and some cases of generalized products of Feferman and Vaught [9]. From the other results the most interesting one is a generalization of completeness theorem. 
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     author = {A. I. Omarov},
     title = {On compact classes of models},
     journal = {Algebra i logika},
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     volume = {6},
     number = {2},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1967_6_2_a4/}
}
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A. I. Omarov. On compact classes of models. Algebra i logika, Tome 6 (1967) no. 2, pp. 49-60. http://geodesic.mathdoc.fr/item/AL_1967_6_2_a4/