NOVÁK, Milan, Pavel POVONDRA and Julie Beryl SELWAY. Schorl-oxy-schorl to dravite-oxy-dravite tourmaline from granitic pegmatites; examples from the Moldanubicum, Czech Republic.
European Journal of Mineralogy. 2004, vol. 16, No 2, p. 323-333. ISSN 0935-1221.