1. H.-J. Bandelt, The tensor product of continuous lattices, Math. Z. 172 (1980) 89–96.
2. H.-J. Bandelt, Tight residuated mappings and d-extensions, in: Universal Algebra (B. Csákány, E. Fried, E.T. Schmidt (Eds.), Colloq. Math. Soc. János Bolyai 29, North-Holland, Amsterdam, 1982, pp. 61–72.
3. A. Białynicki-Birula, H. Rasiowa, On the representation of quasi-Boolean algebras, Bull. Acad. Polon. Sci. Cl. III. 5 (1957) 259–261.
4. T. S. Blyth, M. F. Janowitz, Residuation Theory, Pergamon Press, Oxford, 1972.
5. W. H. Cornish, P. R. Fowler, Coproducts of De Morgan algebras, Bull. Austral. Math. Soc. 16 (1977) 1–13.