Jan Hjelmager Harold Moellering Antony Cooper Tatiana Delgado Abbas Rajabifard Petr Rapant David Danko Michel Huet Dominique Laurent Henri Aalders Adam Iwaniak Paloma Abad Ulrich Düren Alexander Martynenko An initial formal model for spatial data infrastructures. 1295-1309 2008 22 International Journal of Geographical Information Science 11&12 http://dx.doi.org/10.1080/13658810801909623 db/journals/gis/gis22.html#HjelmagerMCDRRDHLAIADM08