Shakshuki, Elhadi M.2006-07-282006-07-2820012001http://hdl.handle.net/10012/647application/pdf7090625 bytesapplication/pdfenCopyright: 2001, Shakshuki, Elhadi M.. All rights reserved.Harvested from Collections CanadaCooperative agents for information gatheringDoctoral Thesis