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- smith, j., & lee, k. (2021). bismuth-based catalysts in polyurethane synthesis: a review. journal of applied polymer science, 138(15), 49876.
- european chemicals agency (echa). reach regulation and heavy metal restrictions, 2022.
- takeda, h., et al. (2020). green catalysts for sustainable coatings: bismuth vs. tin. progress in organic coatings, 145, 105732.
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