[3] P Mernagh T, R Wilde A. Geochimica Et Cosmochimica Acta, 53, 765(1989).
[4] T Walker R, M Samson I. The Canadian Mineralogist, 38, 35(2000).
[5] J Bakker R, M Baumgartner. Mineralogy & Petrology, 95, 1(2009).
[6] J Bakker R. The Canadian Mineralogist, 42, 1283(2004).