| Selway, Julie B., Smeds, Sten-Anders, Černý, Petr, Hawthorne, Frank C. (2002) Compositional evolution of tourmaline in the petalite-subtype Nyköpingsgruvan pegmatites, Utö, Stockholm Archipelago, Sweden. GFF, 124 (2) 93-102 doi:10.1080/11035890201242093 |