@article{10_4171_emss_79,
     author = {Nicholas J. Williams},
     title = {A survey of congruences and quotients of partially~ordered sets},
     journal = {EMS surveys in mathematical sciences},
     pages = {153--203},
     year = {2024},
     volume = {11},
     number = {1},
     doi = {10.4171/emss/79},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/emss/79/}
}