Fernandes, Vítor H.Gomes, Gracinda M. S.Jesus, Manuel M.2010-12-092010-12-0920080021-8693http://hdl.handle.net/10362/4451Journal of Algebra, 321 (2009), p. 743–757Congruences on monoids of transformations preserving the orientation on a finite chainengcongruencesorientation-preservingorientation-reversingtransformationsCongruences on monoids of transformations preserving the orientation on a finite chainjournal article