Article (erne1993distributive)
Erné, M.
Distributive laws for concept lattices
Algebra Universalis,
Birkhäuser Basel,
1993, 30, 538-580
Article (GratzerLasker)
Grätzer, G. & Lakser, H.
On Complete Congruence Lattices of Complete Lattices
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1991, 327, 385-405
Article (hales1964nonexistence)
Hales, A. W.
On the non-existence of free complete Boolean algebras
Fundamentae Mathematica,
1964, 54, 45-66