References
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Dickmann, M. A.: Model theory of infinitary languages. Aarhus University Lecture Notes Series No. 20, 1970.
Hanf, W.: Incompactness in Languages with infinitely long expressions. Fund. Math.53 (1964), 309–324.
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Bell, J.L. On the relationship between weak compactness inL ω 1 ω,L ω 1 ω 1, and restricted second-order languages. Arch math Logik 15, 74–78 (1972). https://doi.org/10.1007/BF02019777
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DOI: https://doi.org/10.1007/BF02019777