H. Jerome Keisler. Unions of relational systems. Proceedings of the American Mathematical Society, vol. 15 (1964), pp. 540–545. - Jan Mycielski. On unions of denumerable models. Algébra i logika. Séminar, vol. 4 no 2 (1965), pp. 57–58.
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1906 ◽
Vol 12
(5)
◽
pp. 223-235
2006 ◽
Vol 38
(04)
◽
pp. 696-697
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