3 citations to https://www.mathnet.ru/rus/ordr1
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Nikolai L. Poliakov, Denis I. Saveliev, “On ultrafilter extensions of first-order models and ultrafilter interpretations”, Arch. Math. Logic, 60:5 (2021), 625
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Denis I. Saveliev, Saharon Shelah, “Ultrafilter extensions do not preserve elementary equivalence”, Mathematical Logic Qtrly, 65:4 (2019), 511
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Nikolai L. Poliakov, Denis I. Saveliev, “On two concepts of ultrafilter extensions of first-order models and their generalizations”, Lecture Notes in Comput. Sci., 10388 (2017), 336–348