1. A. V. DiGullio, U.S. Pat. 3,840,499 (1974) (to Arco Polymers).
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3. M. Lambla, Course of Reactive Processing of Thermoplastic Polymers, Leuven (1991).
4. E. R. Moore, L. E. Smith, and D. M. Pickelman, U.S. Pat. 3,801,549 (1974) (to Dow Chemical Co.).