1. B. Banaschewski,Injectivity and essential extensions in equational classes of algebras, Proceedings of the conference on Universal Algebra (1969), Queen’s Papers in Pure and Applied Mathematics25 (1970), 131–147.
2. B. Banaschewski and G. Bruns,Injective hulls in the category of distributive lattices, J. für die Reine und Angewandte Mathematik232 (1968), 102–109.
3. Alan Day,Injectives in non-distributive equational classes of lattices are trivial, Archiv Math. (Basel)21 (1970), 113–115.
4. P. Erdös,Some set-theoretical properties of graphs, Tucuman Revista Mathematicas. Series A,3 (1942), 363–367.
5. P. Erdös and R. Rado,A partition calculus in set theory, Bull. Amer. Math. Soc.62 (1956), 427–489.