Generalized morphisms of abelian m-ary groups Alexander M. Gal'mak (2001) Discussiones Mathematicae - General Algebra and Applications We prove that the set of all n-ary endomorphisms of an abelian m-ary group forms an (m,n)-ring.
Generalized Weisner designs and quasigroups. Stojaković, Zoran, Dudek, Wiesław A. (1998) Novi Sad Journal of Mathematics