@article{155d28ffdb734248a9ec89a6e9dfdfcb,
title = "Specification and implementation of constraints in GIS - with illustrations from a VR system",
keywords = "CWTS JFIS < 0.75",
author = "JH Louwsma and S Zlatanova and {van Lammeren}, R and {van Oosterom}, PJM",
year = "2006",
language = "Undefined/Unknown",
volume = "10",
pages = "531--550",
journal = "Geoinformatica: an international journal on advances of computer science for geographic information systems",
issn = "1384-6175",
publisher = "Kluwer Academic Publishers",
number = "4",
}