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  1. "polyurethane foams: chemistry, processing and applications"
    author: rainer h?fer
    publisher: elsevier
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  2. "sustainable blowing agents for polyurethane foams"
    journal: green chemistry
    doi: 10.1039/d2gc00123a
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  3. "foam structure and performance in cleaning products"
    author: maria l. cortez
    published in: journal of applied polymer science
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