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5.
Piperno, A. and J. Wojtasinski.1972. International Cellular Plastics Conference in Montreal.
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Yoshimura, H., S. Okuzono, S. Arai and D. W. Lowe.1990. Proceedings of SPI 33rd Annual Technical/Marketing Conference, p. 10. J. Cellular Plastics, (Sept/Oct):389.