@article{10_21136_CMJ_1992_128341,
     author = {Jordens, Olav},
     title = {On modularity in lattices of congruences on ordered sets},
     journal = {Czechoslovak Mathematical Journal},
     pages = {451--460},
     publisher = {mathdoc},
     volume = {42},
     number = {3},
     year = {1992},
     doi = {10.21136/CMJ.1992.128341},
     mrnumber = {1179307},
     zbl = {0793.06004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1992.128341/}
}