@phdthesis{Dicken1997,
  author      = {Volker Dicken},
  title       = {Simultaneous Activity and Attenuation Reconstruction in Single Photon Emission Computed Tomography, a Nonlinear Ill-Posed Problem},
  type        = {doctoralthesis},
  pages       = {124 S.},
  year        = {1997},
}