@article{10_4153_CMB_1998_041_7,
     author = {Gr\"atzer, G. and Lakser, H. and Schmidt, E. T.},
     title = {Congruence {Lattices} of {Finite} {Semimodular} {Lattices}},
     journal = {Canadian mathematical bulletin},
     pages = {290--297},
     year = {1998},
     volume = {41},
     number = {3},
     doi = {10.4153/CMB-1998-041-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1998-041-7/}
}