China’s pearl industry: An indicator of ecological stress. Published in the Journal of the Gemmological Association of Hong Kong GAHK, 2013.
Author(s): L.E. Cartier, S.H. Ali
Structural and chemical investigations on shells and pearls of nacre-forming saltwater and freshwater bivalve molluscs. Published in Journal of Gemmology, 1994.
Author(s): H.A. Haenni