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    1. zhang, l., et al. (2019). "synthesis and characterization of waterborne polyurethane using bismuth catalysts." progress in organic coatings, 129, 115¨C122.

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    2. wang, y., & liu, j. (2020). "comparative study on the catalytic performance of bismuth-based catalysts in aqueous polyurethane systems." journal of applied polymer science, 137(20), 48732.

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    3. kamal, m.r., et al. (2017). "catalysis in polyurethane synthesis: a review." polymer reviews, 57(3), 449¨C478.

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    4. liu, h., et al. (2021). "low-toxicity metal catalysts for sustainable polyurethane production." green chemistry, 23(15), 5498¨C5512.

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    5. chen, x., & sun, j. (2018). "application of bismuth carboxylates in two-component waterborne polyurethane coatings." chinese journal of polymer science, 36(6), 701¨C709.

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    6. din en iso 11930:2012 skin irritation testing methods ¨C in vitro method.

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    7. astm d6988-13 standard guide for determination of volatile organic compounds in waterborne coatings.

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