@incollection{Hasan79,
  author	= {Hasan, Ruqaiya},
  editor	= {Pet{\"o}fi, Janos},
  year		= {1979},
  title		= {On the notion of text},
  booktitle	= {Text versus Sentence: basic questions of text linguistics},
  series	= {Papers in Text Linguistics},
  number	= {20},
  publisher	= {Buske},
  address	= {Hamburg}
}