@unpublished{NeitzelWachsmuth:2020,
  author = {Neitzel, Ira and Wachsmuth, Gerd},
  title = {{First-order conditions for the optimal control of the obstacle problem with state constraints}},
  annote = {article, submitted},
  note={also available as arXive Preprint arXiv:2012.15324}
  year = {2020}
}