@TECHREPORT{ Leeds00tech,
author = {Brandon Bennett and A.G. Cohn and P. Torrini and S.M. Hazarika},
title = {Region-Based Qualitative Geometry},
institution = {University of Leeds, School of Computer Studies},
year = {2000},
number = {2000.07},
address = {LS2 9JT, UK},
note = {\url{www.scs.leeds.ac.uk/services/reports/2000.html}},
leeds_file = {rbg_tech.ps}
}