@article{SJC_2012_6_4_a4,
     author = {Shtrakov, Slavcho and Koppitz, J\"org},
     title = {Finite {Symmetric} {Functions} with {Non-Trivial} {Arity} {Gap}},
     journal = {Serdica Journal of Computing},
     pages = {419--436},
     year = {2012},
     volume = {6},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SJC_2012_6_4_a4/}
}