A few Remarks on n-infinite Forcing Companions Milan Z. Grulović (2007) Publications de l'Institut Mathématique
Another approach to infinite forcing Joram Hirschfeld (1976) Annales scientifiques de l'Université de Clermont. Mathématiques
Axiomatization of the forcing relation with an application to Peano Arithmetic Zofia Adamowicz (1984) Fundamenta Mathematicae