@article{CorPur:85,
  journal = {Mathematica (Cluj)},
  volume = {27(50)},
  title = {Relations between the homomorphisms of semigroups and the
           homomorphisms of their $n$-ary extensions},
  author = {Corovei, Ilie and Purdea, Ioan},
  year = 1985,
  pages = {101--106},
  number = {2},
}