@incollection{NegSul:78a,
  volume = {10},
  title = {Optimization in fuzzy environment},
  year = {1978},
  booktitle = {Digital processing and transmission of data and control of
               processes by means of computers},
  pages = {241--251},
  publisher = {Ed. Acad. R.S. Rom\^ania, Bucharest},
  author = {Negoi{\c{t}}{\u{a}}, Constantin Virgil and Sularia, Mircea},
  series = {Probleme de Automat.},
}