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Lua MLA (9ú heag.)International Union of Geological Sciences. Subcommission on the Systematics of Igneous Rocks agus R. W. Le Maitre. Igneous Rocks: A Classification and Glossary of Terms : Recommendations of the International Union of Geological Sciences, Subcommission on the Systematics of Igneous Rocks. 2nd ed. Cambridge University Press, 2002.