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  1. h. ulrich, chemistry and technology of polyols for polyurethanes, ismithers rapra publishing, 2005.
  2. g. oertel (ed.), polyurethane handbook, 2nd edition, hanser publishers, 1994.
  3. s. safronova et al., "effect of catalysts on the cellular structure and thermal properties of rigid polyurethane foams", journal of cellular plastics, 2018, vol. 54(2), pp. 123¨C137.
  4. m. k. choudhary et al., "role of organotin catalysts in the formation of polyurethane foams: a review", polymer engineering & science, 2017, vol. 57(6), pp. 555¨C563.

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