@article{2003-VanGils-InformationSupply,
  author        = {Gils, B. van and Proper, H.A. (Erik) and Bommel, P. van},
  title         = {A conceptual model of Information Supply},
  journal       = {Data {\&} Knowledge Engineering},
  volume        = {51},
  year          = {2004},
  pages         = {189--222},
}