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2.
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3.
Arai, S., Tamano, Y., Kumoi, S., and Tsutsumi, Y, Toyo Soda Kenkyu-Hokoku, Vol. 28, p. 23 (1984).
4.
Toyo Soda's Technical Bulletin Nol. B-58104-E.
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Nichols, J. B., Christen, J. D., Booth, L. D., and Clarke, W. D., "High Performance Appliance Insulation Using MDI Based Urethane Chemistry," SPI 28th Annual Technical/Marketing Conference, M. J. Cartmell and B. Macneall , Modern Plastics, p. 34 (Jan. 1985).