David W. Kueker. Löwenheim–Skolem and interpolation theorems in infinitary languages. Bulletin of the American Mathematical Society, vol. 78 (1972), pp. 211–215. - K. Jon Barwise. Mostowski's collapsing function and the closed unbounded filter. Fundamenta mathematicae, vol. 82 no. 2 (1974), pp. 95–103. - David W. Kueker. Countable approximations and Löwenheim–Skolem theorems. Annals of mathematical logic, vol. 11 (1977), pp. 57–103.
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