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    1. oertel, g. (ed.). polyurethane handbook. hanser gardner publications, 1993.

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    2. langanke, j., et al. "biobased and nontoxic catalysts for polyurethane synthesis." green chemistry, vol. 16, no. 4, 2014, pp. 1893¨C1904.

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    3. zhang, y., et al. "development of low-emission polyurethane foam using eco-friendly catalyst systems." journal of applied polymer science, vol. 135, no. 37, 2018, p. 46639.

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    4. wang, x., et al. "recent advances in catalytic systems for polyurethane synthesis." progress in polymer science, vol. 105, 2021, p. 101403.

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    5. Öйú¹ú¼Ò±ê×¼ gb/t 19229.3-2012¡¶Ð¬Àà¾Û°±õ¥Î¢¿×²ÄÁÏ¡·

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    6. iso 2439:2022 flexible cellular polymeric materials ¡ª determination of hardness (indentation technique).

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