Enrique Sánchez Villamil Carlos González Muñoz Rafael C. Carrasco XMLibrary Search: An XML Search Engine Oriented to Digital Libraries. 81-91 2005 conf/ercimdl/2005 ECDL http://dx.doi.org/10.1007/11551362_8 db/conf/ercimdl/ecdl2005.html#VillamilMC05