@article{Vogel1998,
  author    = {Vogel, Hans-J{\"u}rgen},
  title     = {On functors between certain monoidal categories},
  year      = {1998},
  language  = {en}
}
@book{Vogel1998,
  author    = {Vogel, Hans-J{\"u}rgen},
  title     = {On morphisms between partial algebras},
  series = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Mathematik},
  volume    = {1998, 13},
  journal   = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Mathematik},
  publisher = {Univ.},
  address   = {Potsdam},
  pages     = {27 Bl.},
  year      = {1998},
  language  = {en}
}