@phdthesis{Langer2003,
  author      = {Katharina Langer},
  title       = {K+-Hom{\"o}ostase und kaliumabh{\"a}ngige Xylogenese in Populus tremula L. x Populus tremuloides Michx},
  type        = {doctoralthesis},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year        = {2003},
}