@article{DBLP:journals/geoinformatica/BehrG10,
author = {Thomas Behr and
Ralf Hartmut G{\"u}ting},
title = {User defined topological predicates in database systems},
journal = {GeoInformatica},
volume = {14},
number = {1},
year = {2010},
pages = {23-53},
ee = {http://dx.doi.org/10.1007/s10707-008-0075-y},
bibsource = {DBLP, http://dblp.uni-trier.de}
}