1. Marietta Resources International Ltd., 1475 Graham Bell, Boucherville, Québec, Canada J4B 6A1.
2. Kemira Oy, Malminkatu 30, 00100 Helsinki 10, Finland.
3. and ?Handbook of Fillers and Reinforcements for Plastics?, Ch. 8, Van Nostrand Reinhold, (1978).
4. Performance of the university of Toronto infrasizer MK III as a monosizer and multi-cut classifier
5. Talystep 1, The Rank Organization, Rank Taylor Hobson, Leicester, England.