@article{10_1017_S0017089505002648,
     author = {FERNANDES, V\'ITOR H. and GOMES, GRACINDA M. S. and JESUS, MANUEL M.},
     title = {CONGRUENCES {ON} {MONOIDS} {OF} {ORDER-PRESERVING} {OR} {ORDER-REVERSING} {TRANSFORMATIONS} {ON} {A} {FINITE} {CHAIN}},
     journal = {Glasgow mathematical journal},
     pages = {413--424},
     year = {2005},
     volume = {47},
     number = {2},
     doi = {10.1017/S0017089505002648},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089505002648/}
}