@book{Wollenberg1994,
  author    = {Wollenberg, Manfred},
  title     = {On an inverse problem in modular theory},
  series = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Mathematik},
  volume    = {1994, 07},
  journal   = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Mathematik},
  publisher = {Univ.},
  address   = {Potsdam},
  pages     = {14 S.},
  year      = {1994},
  language  = {en}
}