„Color in the beryl group”. Mineral Spectroscopy Server. minerals.caltech.edu. California Institute of Technology. Архивирано из оригинала 2011-08-22. г. Приступљено 2009-06-06.
doi.org
Ibragimova, E.M.; Mukhamedshina, N.M.; Islamov, A.Kh. (2009). „Correlations between admixtures and color centers created upon irradiation of natural beryl crystals”. Inorganic Materials. 45 (2): 162. S2CID96344887. doi:10.1134/S0020168509020101.
Ibragimova, E.M.; Mukhamedshina, N.M.; Islamov, A.Kh. (2009). „Correlations between admixtures and color centers created upon irradiation of natural beryl crystals”. Inorganic Materials. 45 (2): 162. S2CID96344887. doi:10.1134/S0020168509020101.
„Color in the beryl group”. Mineral Spectroscopy Server. minerals.caltech.edu. California Institute of Technology. Архивирано из оригинала 2011-08-22. г. Приступљено 2009-06-06.