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  1. zhang, y., et al. (2022). "synthesis and application of non-tin catalysts for polyurethane foaming." journal of applied polymer science, 139(15), 51234.
  2. li, x., et al. (2023). "zno nanoparticle-based catalysts for water-blown polyurethane foams." chinese journal of polymer science, 41(2), 234¨C242.
  3. industries ag. (2021). "polycat? sa-1: delayed action amine catalyst for polyurethane foams." technical bulletin.
  4. se. (2020). "new amidine-based catalyst systems for low-temperature foaming applications." journal of cellular plastics, 56(4), 391¨C402.
  5. chemical company. (2023). "niax? catalyst a-series: high-performance solutions for spray polyurethane foams." foam expo presentation.

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