@incollection{Cet:04,
  volume = {148},
  title = {Marcus contextual grammars},
  year = {2004},
  booktitle = {Formal languages and applications},
  pages = {335--366},
  publisher = {Springer},
  address = {Berlin},
  author = {Ceterchi, Rodica},
  series = {Stud. Fuzziness Soft Comput.},
}