Gomes, C. S. F., et al. “POTENTIALITIES FOR THERAPEUTIC PURPOSES OF THE BIOGENIC CARBONATE SAND OCCURRING IN SOME ISLANDS OF THE MACARONESIA ARCHIPELAGO BASED ON THEIR UNIQUE CHEMICAL AND PHYSICAL PROPERTIES”. Geochimica Brasiliensis, vol. 23, no. 3, Feb. 2012, https://geobrasiliensis.org.br/geobrasiliensis/article/view/314.