1. Geochemistry of biotites from granitic rocks, northern Portugal;Abuquerque;Geochim. Cosmochim. Acta,1973
2. Fluorine in graniti melt, a review;Bailey;Chem. Geol.,1977
3. Distribution of selected elements in feldspar, biotite and muscovite from British granites in relation to mineralization;Bradshaw;Trans. Inst. Min. Metall.,1967
4. Iron-titanium oxide minerals and synthetic equivalents;Buddington;J. Petrology,1964
5. Burham, 1967. Ref. not stated.