@article{ZiemonsHerzogBosettietal.1992,
  author    = {Ziemons, Karl and Herzog, H. and Bosetti, P. and Feinendegen, L. E.},
  title     = {Iterative image reconstruction with weighted pixel contribution to projection elements},
  series = {European Journal of Nuclear Medicine},
  volume    = {19},
  journal   = {European Journal of Nuclear Medicine},
  number    = {8},
  isbn      = {1619-7089},
  pages     = {588 -- 588},
  year      = {1992},
  language  = {en}
}
@article{ZiemonsHerzogFeinendegen1990,
  author    = {Ziemons, Karl and Herzog, H. and Feinendegen, L. E.},
  title     = {Iterative image reconstruction with weighted pixel contribution to projection element},
  series = {European Journal of Nuclear Medicine},
  volume    = {16},
  journal   = {European Journal of Nuclear Medicine},
  number    = {7},
  isbn      = {1619-7089},
  pages     = {403 -- 403},
  year      = {1990},
  language  = {en}
}