@article{DMGAA_2009_29_1_a3,
     author = {Denecke, Klaus and Lekkoksung, Somsak},
     title = {Hyperidentities in many-sorted algebras},
     journal = {Discussiones Mathematicae. General Algebra and Applications},
     pages = {47--74},
     publisher = {mathdoc},
     volume = {29},
     number = {1},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGAA_2009_29_1_a3/}
}