@Misc{ 
  ambcrifig10,
  author = { Ambrosio, Luigi and Crippa, Gianluca and Figalli, Alessio and Spinolo, Laura Valentina },
  title = { Existence and uniqueness results for the continuity equation and applications to the chromatography system },
  journal = { IMA Vol. Math. Appl., Springer },
  year = { 2010 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/623/ },
  note = { cvgmt preprint}
}