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2. R. G. Pirich and D. J. Larson: Grumman Research and Development Center, Bethpage, NY, unpublished research, 1980.
3. R.G. Pirich and D.J. Larson:Matl. Proc. in the Reduced Gravity Envir. of Space, Elvesier Science Publishing Co., New York, NY, March 1982, pp. 523–31.
4. R. G. Pirich: Grumman Research and Development Center, Bethpage, NY, unpublished research, 1982.
5. T. Chen:J. App. Phys., 1974, vol. 45, p. 2358.