@incollection{DiNoGeoSes:96,
  volume = {235},
  title = {Closed ideals of {MV}-algebras},
  year = {1999},
  booktitle = {Advances in contemporary logic and computer science (Salvador,
               1996)},
  pages = {99--112},
  publisher = {Amer. Math. Soc.},
  address = {Providence, RI},
  author = {Di Nola, Antonio and Georgescu, George and Sessa, Salvatore},
  series = {Contemp. Math.},
}