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    1. "catalyst selection for polyurethane foaming applications", by m. szycher, journal of cellular plastics, 2016

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    2. "delayed gel catalysts in shoe sole manufacturing", by r. j. cella, foam expo europe, 2019

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    3. "advances in sustainable polyurethanes: from raw materials to end-of-life", by g. madalinska et al., green chemistry, 2021

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