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2. Schmolka, I.R., and R.K. Scizinger,Ibid. 46:115 (1969).
3. Schmolka, I.R., U.S. Patent 4,343,785 (1982).
4. Schmolka, I.R., U.S. Patent 4,360,451 (1982).
5. Schmolka, I.R., U.S. Patent 4,376,764 (1983).