@incollection{Langacker82,
  author	= {Langacker, R.},
  editor	= {Hopper, P. J.},
  year		= {1982},
  title		= {Remarks on English Aspect},
  booktitle	= {Tense-Aspect: between Semantics and Pragmatics},
  publisher	= {John Benjamins},
  address	= {Amsterdam/Philadelphia}
}