@phdthesis{Schmidt2018,
  author      = {Isabelle Schmidt},
  title       = {Self-Concept of Students in Childhood and Adolescence:Structural and Developmental Issues},
  type        = {doctoralthesis},
  school      = {Universit{\"a}t Trier},
  doi       = {10.25353/ubtr-xxxx-367b-156c/},
  year        = {2018},
}