@phdthesis{Steck2018,
  author      = {Daniel Steck},
  title       = {Lagrange Multiplier Methods for Constrained Optimization and Variational Problems in Banach Spaces},
  type        = {doctoralthesis},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year        = {2018},
}