@phdthesis{Hounnon2002,
  author    = {Hounnon, Hippolyte},
  title     = {Hyperidentities in semirings and applications},
  series = {Berichte aus der Mathematik},
  journal   = {Berichte aus der Mathematik},
  publisher = {Shaker},
  address   = {Aachen},
  isbn      = {3-8322-0791-0},
  pages     = {74 S.},
  year      = {2002},
  language  = {en}
}