@article{NSJOM_2004_34_2a_6,
     author = {K. Denecke and K. G\l azek and St. Niwczyk},
     title = {Clone 

 automorphisms and hypersubstitutions},
     journal = {Novi Sad Journal of Mathematics},
     pages = {99-108},
     publisher = {mathdoc},
     volume = {34},
     number = {2},
     year = {2004},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2004_34_2a_6/}
}