Erné, M. (1993), 'Distributive laws for concept lattices', Algebra Universalis 30 , 538-580 .
[BibTeX]  [Endnote] 

1991

Grätzer, G. & Lakser, H. (1991), 'On Complete Congruence Lattices of Complete Lattices', Trans. Amer. Math. Soc. 327 (1) , 385--405 .
[BibTeX]  [Endnote] 

1964

Hales, A. W. (1964), 'On the non-existence of free complete Boolean algebras', Fundamentae Mathematica 54 , 45-66 .
[BibTeX]  [Endnote]