1. BOWN, M.G., ZEITSCHRIFT FUR KRISTALLOGRAPHIE 111: 1 (1958).
2. CARPENTER, R.H., RANGE IN SOLID SOLUTION + STRUCTURE OF NATURALLY OCCURRING TROILITE + PYRRHOTITE, AMERICAN MINERALOGIST 49: 1350 (1964).
3. DESBOROUGH, G.A., ECON GEOL 60: 1431 (1965).
4. GRONVOLD, F, ACTA CHEMICA SCANDINAVICA 6: 1452 (1952).
5. MEGAW, H, PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES 259: 59 (1960).