@phdthesis{Ye2013,
  author      = {Xuancan Ye},
  title       = {Some Preconditioners in Optimization with Partial Differential Equations},
  type        = {doctoralthesis},
  school      = {Universit{\"a}t Trier},
  doi       = {10.25353/ubtr-xxxx-e6ad-7d5e/},
  year        = {2013},
}