@article{DMGAA_2001_21_2_a6,
     author = {Arworn, Sr. and Denecke, Klaus},
     title = {Tree transformations defined by hypersubstitutions},
     journal = {Discussiones Mathematicae. General Algebra and Applications},
     pages = {219--227},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {2001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGAA_2001_21_2_a6/}
}