@article{SF_1990__41_2_135055,
     author = {C.M. Reis},
     title = {F-disjunctive congruences and a generalization of monoids with length.},
     journal = {Semigroup forum},
     pages = {291--306},
     publisher = {mathdoc},
     volume = {41},
     number = {2},
     year = {1990},
     zbl = {0703.20057},
     url = {http://geodesic.mathdoc.fr/item/SF_1990__41_2_135055/}
}