Compactness and normality in abstract logics

Dickman, 1985, Large infinitary languages Ebbinghaus, 1985, Extended logics, the general framework Feferman, 1959, The first order properties of products of algebraic systems, Fund. Math., XLVII, 57, 10.4064/fm-47-1-57-103 Gillman, 1960 Makowsky, 1985, Compactness, embeddings and definability Mundici, 1986, Inverse topological systems and compactness in abstract model theory, J. Symbolic Logic, 51, 785, 10.2307/2274032 Noble, 1971, Products with closed projections II, Trans. Amer. Math. Soc., 160, 169, 10.1090/S0002-9947-1971-0283749-X Przymusińsky, 1984, Products of normal spaces, 781 Väänänen, 1977, On the compactness theorem, Proceedings of the Symposium on Mathematical Logic, 62 Willard, 1970