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"All three commentators [i.e. Vaught, van Heijenoort and Dreben] agree that both the completeness and compactness theorems were implicit in Skolem 1923...." [Dawson, J. W. (1993). "The compactness of first-order logic:from Gödel to Lindström". History and Philosophy of Logic. 14: 15–37. doi:10.1080/01445349308837208.]
Ax, James; Kochen, Simon (1965). "Diophantine Problems Over Local Fields: I.". American Journal of Mathematics. 87 (3): 605–630. doi:10.2307/2373065. JSTOR2373065.