@incollection{Haustein,
  author    = {Jens Haustein},
  title     = {Ludwig Ettm{\"u}llers Jenaer Habilitation vom Jahr 1831},
  booktitle = {Vir ingenio mirandus : Studies presented to John L. Flood},
  number    = {210 / 2},
  isbn      = {3-87452-961-4},
}