AHRIZ, H. and TOMASENA, M. 1999. Modeling as a fragment assembling process. In Price, C. (ed.) Proceedings of the 13th International workshop on qualitative reasoning (QR99), 6-9 June 1999, Loch Awe, UK. Evanston, IL: Qualitative Reasoning Group [online], pages 1-10. Available from: http://www.qrg.northwestern.edu/papers/Files/qr-workshops/QR99/Ahriz_1999_Modeling_Fragment_Assembling_Process.pdf