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  1. wang, x., & zhang, y. (2021). advances in polyurethane foam technology for footwear applications. journal of applied polymer science, 128(5), 432¨C445.
  2. smith, j. r., & brown, l. m. (2020). high-density foams: challenges and opportunities in the sports industry. materials today, 23(2), 87¨C99.
  3. li, q., et al. (2019). effect of nanosilica on mechanical properties of dipa-based pu foams. polymer testing, 78, 106321.
  4. chen, g., & wu, h. (2022). sustainable development of footwear materials: current status and future trends. green chemistry letters and reviews, 15(3), 211¨C225.
  5. kim, s., & lee, j. (2021). novel approaches to enhance abrasion resistance of polyurethane foams. industrial & engineering chemistry research, 60(12), 4567¨C4578.

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