@article{DMGAA_2006_26_2_a6,
     author = {Denecke, Klaus and Srithus, Rattana},
     title = {Binary relations on the monoid of {V-proper} hypersubstitutions},
     journal = {Discussiones Mathematicae. General Algebra and Applications},
     pages = {233--251},
     publisher = {mathdoc},
     volume = {26},
     number = {2},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGAA_2006_26_2_a6/}
}