@phdthesis{Portmann2011,
  author      = {Felix Theodor Portmann},
  title       = {Global estimation of monthly irrigated and rainfed crop areas on a 5 arc-minute grid},
  type        = {doctoralthesis},
  pages       = {239},
  school      = {Universit{\"a}tsbibliothek Johann Christian Senckenberg},
  year        = {2011},
}