@article{DMGAA_2003_23_1_a3,
     author = {Changphas, Thawhat and Denecke, Klaus},
     title = {Complexity of hypersubstitutions and lattices of varieties},
     journal = {Discussiones Mathematicae. General Algebra and Applications},
     pages = {31--43},
     publisher = {mathdoc},
     volume = {23},
     number = {1},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGAA_2003_23_1_a3/}
}