Fadda, S., M. Fiori, S. Pretti, and P. Valera. “MANGANESE MINERALISATIONS AT THE BASE OF MIOCENE SEDIMENTS IN NORTHERN SARDINIA (ITALY)”. Bulletin of the Geological Society of Greece, vol. 43, no. 5, Jan. 2010, pp. 2588-96, doi:10.12681/bgsg.11666.