1. R.G. Arnold and L.E. Reichen, “Measurement of the Metal Content of Natural Occurring Metal-Deficient, Hexagonal Pyrrhotite by an X-ray Spacing Method,” Am. Mineral., 47 (1962), pp. 105–111.
2. R.G. Arnold, “Mixtures of Hexagonal and Monoclinic Pyrrhotite and the Measurement of the Metal Content of Pyrrhotite by X-ray Diffraction,” Am. Mineral., 51 (1966), pp. 1221–1227.
3. D.I. Groves and R.J. Ford, “Note on the Measurement of Pyrrhotite Composition in the Presence of Both Hexagonal and Monoclinic Phases,” Am. Mineral, 48 (1963), pp. 911–913.
4. P.R. Buseck, “Discussion of ‘Pyrrhotite Measurement’ by Groves and Ford,” Am. Mineral, 49 (1964), pp. 1491–1495.
5. S.A. Kissin, “Phase Relations in a Portion of the Fe-S System,” Ph.D. thesis, University of Toronto, Canada (1974).