BibTex format
@misc{Davies:2003,
author = {Davies, BL and Harris, SJ and Rodriguez, y Baena F and Jakopec, M},
title = {Apparatus and method for registering the position of a surgical robot},
type = {Patent},
url = {http://v3.espacenet.com/textdoc?DB=EPODOC&IDX=WO03043515&F=0},
year = {2003}
}