Samuel Croset Christoph Grabmüller Chen Li Silvestras Kavaliauskas Dietrich Rebholz-Schuhmann The CALBC RDF Triple Store: retrieval over large literature content http://arxiv.org/abs/1012.1650 2010 CoRR abs/1012.1650 db/journals/corr/corr1012.html#abs-1012-1650