[1] R. W. QUACKENBUSH:
A note on a problem of Goralčík. Coll. Math. Soc. János Bolyai, Vol. 17. Contributions to Universal Algebra, Szeged (Hungary) (1975), 363-364.
MR 0476612
[2] H. WERNER:
Which partition lattices are congruence lattices?. Coll. Math. Soc. János Bolyai, Vol. 14. Lattice Theory, Szeged (Hungary) (1974), 433-453.
MR 0441830