@Misc{ 
  ButMaiVel21,
  author = { Buttazzo, Giuseppe and Maiale, Francesco Paolo and Velichkov, Bozhidar },
  title = { Shape optimization problems in control form },
  journal = {  },
  year = { 2021 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5129/ },
  note = { cvgmt preprint}
}