@article{CMUC_2013__54_4_a1,
     author = {Seif, Steve},
     title = {Congruence lattices of intransitive {G-Sets} and flat {M-Sets}},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {459--484},
     publisher = {mathdoc},
     volume = {54},
     number = {4},
     year = {2013},
     mrnumber = {3125070},
     zbl = {1305.08004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2013__54_4_a1/}
}