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R. Gravelsins and O. Trass, "Wet Grinding of Wood with the Szego Mill," in Proc. 7th Cdn. Bioenergy R & D Seminar, edited by E. N. Hogan, Ottawa, Ontario, p 281-286 (April 1989). Google Scholar T. Molder and O. Trass, "Grinding of Waste Paper and Rice Hulls with the Szego Mill for Use as Plastics Fillers," Int. J. Miner. Proc.