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  1. liu, x., et al. (2021). recent advances in non-tin catalysts for polyurethane foam production. progress in polymer science, 112, 101408.
  2. zhang, y., & wang, h. (2020). development and application of high resilience flexible polyurethane foams. journal of applied polymer science, 137(15), 48567.
  3. smith, j., & brown, r. (2019). environmental impact of tin-based catalysts in polyurethane manufacturing: a review. green chemistry, 21(5), 1122-1133.
  4. european chemicals agency (echa). (2022). restrictions on organotin compounds under reach regulation.
  5. american chemistry council (acc). (2021). polyurethanes industry report ¨C catalyst trends and innovations.
  6. li, m., et al. (2022). bi-based catalysts for polyurethane foam: synthesis, characterization and performance evaluation. industrial & engineering chemistry research, 61(12), 4321¨C4330.

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