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  1. g. oertel, polyurethane handbook, hanser publishers, 2nd edition, 1994.
  2. j. h. saunders, k. c. frisch, chemistry of polyurethanes, crc press, 1962.
  3. m. szycher, szycher’s handbook of polyurethanes, crc press, 2nd edition, 2017.

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