@techreport{duvigneaud1981the,
  title = {The components of Charleroi's ecosystem and the prospects for regional socio-economic development (preliminary study).}
  author = {Duvigneaud, P. and Denayer, S. and Brichard, C. and Brichard, C. and Bouchat, A. and Moniquet, J.-C. and Chasseur, C.},
  publisher = {Bulletin Economique du Hainaut},
  year = {1981}
}