Errata to the paper "Generalizing Vaught sentences from ω to strong cofinality ω", Fundamenta Mathematicae 82 (1974), pp. 105-119 M. Makkai — 1975 Fundamenta Mathematicae
Svenonius sentences and Lindström's theory on preservation theorems M. Makkai — 1972 Fundamenta Mathematicae
Accessible embeddings and the solution-set condition H. Hu; M. Makkai — 1994 Cahiers de Topologie et Géométrie Différentielle Catégoriques