1. Optical symmetry from reflectivity measurements;Cameron;Am. Mineralogist,1963
2. The calculation of stopping power and backscatter effects in electron probe microanalysis;Duncumb;N.B.S. Spec. Publ. No. 298,1968
3. Zur Optik von Hämatit und Ilmenit;von Gehlen;Neues Fahrb. Mineral., Monatsh.,1965
4. X-ray absorption uncertainty;Heinrich,1966
5. Colour measurements in ore-microscopy;Piller;Mineral. Deposita,1966