@phdthesis{Hartmann2013,
  author      = {Lena Hartmann},
  title       = {Are environmental conditions predisposing to calcium-deficiency rickets in developing countries? : A community-based case study from rural Kaduna, northern Nigeria},
  type        = {doctoralthesis},
  pages       = {XXIV, 155},
  school      = {Universit{\"a}tsbibliothek Johann Christian Senckenberg},
  year        = {2013},
}