@Article{ 
  amagia03,
  author = { Amar, Micol and Gianni, Roberto },
  title = { Effective saturation for composite porous media },
  journal = { Atti Accad. Naz. Lincei Cl. Sci. Fis. Mat. Natur. },
  year = { 2003 },
  volume = { XIV },
  number = { 4 },
  pages = { 297-305 },
  URL = { http://cvgmt.sns.it/paper/239/ },
  note = { cvgmt preprint}
}