Rafael Tolosana-Calasanz José A. Álvarez-Robles Javier Lacasta Javier Nogueras-Iso Pedro R. Muro-Medrano F. Javier Zarazaga-Soria On the Problem of Identifying the Quality of Geographic Metadata. 232-243 2006 conf/ercimdl/2006 ECDL http://dx.doi.org/10.1007/11863878_20 db/conf/ercimdl/ecdl2006.html#Tolosana-CalasanzALNMZ06