Petrographic study of the tumular cist with carved steles of Reguers de Seró (Artesa de Segre, Lleida, Catalonia). - García Vallés, M. (Interdisciplinary studies on ancient stone : proceedings of the IX Association for the Study of Marble and Other Stones in Antiquity (ASMOSIA) conference (Tarragona 2009)., 2012)