@inproceedings{DBLP:conf/comad/AkkerB91,
author = {Bert van den Akker and
Henk M. Blanken},
title = {Geographic Data Modeling in TM},
booktitle = {COMAD},
year = {1991},
pages = {107-126},
bibsource = {DBLP, http://dblp.uni-trier.de}
}