@Misc{ 
  FalSanSec19,
  author = { Fall, Boubacar and Santambrogio, Filippo and Seck, Diaraf },
  title = { Shape Derivative for Obstacles in Crowd Motion },
  journal = { Mathematics in Engineering },
  year = { 2021 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4524/ },
  note = { cvgmt preprint}
}