@incollection{compref161,
   author = {Heylighen,F},
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   editor = {   publisher = {AFCET},
   address = {Paris},
   pages = {23-32}
}

@misc{compref160,
   author = {Heylighen,F},
   year = {1991},
   title = {Modelling Emergence},
   howpublished = {ftp papers from Principia Cybernetical server, also for "world Futures: the Journal of General Eveloution", special issue on creative evolution, G. Kampis (ed)}
}

@incollection{compref159,
   author = {Heylighen,F},
   year = {1990},
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   booktitle = {Cybernetics and Systems '90},
   editor = {Trappl,R},
   publisher = {World Scientific},
   address = {Singapore},
   pages = {335-341}
}