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k. j. tulloch, r. w. layer. "catalysis in urethane foam systems: amines and organometallics." journal of cellular plastics, 1975, 11(4): 210-218.
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m. s. sain, et al. "development of wood-plastic composites and polyurethane foams for outdoor applications." polymer composites, 2008, 29(7): 727-735.
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