@Misc{ 
  ChiGonPic21,
  author = { Chiri, Maria Teresa and Gong, Xiaoqian and Piccoli, Benedetto },
  title = { Hybrid multi-population traffic flow model: Optimal control for a mean-field limit },
  journal = {  },
  year = { 2021 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5302/ },
  note = { cvgmt preprint}
}