El Reticulo De Las Logicas De Primer Orden Con Cuantificadores Cardinales. Luis Jaime Corredor (1986) Revista colombiana de matematicas
Embeddings, amalgamation and elementary equivalence: the representation of compact logics Daniele Mundici (1984) Fundamenta Mathematicae
Extensions of countable infinitary logic which preserve most of its nice properties. Leo Harrington (1980) Archiv für mathematische Logik und Grundlagenforschung