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  2. European Committee for Standardization (CEN). (2021). EN ISO 13688:2021 – Protective clothing ¡ª General requirements. Brussels: CEN.
  3. Li, Y., et al. (2021). "Antimicrobial properties of chitosan-coated polylactic acid fibers for sustainable protective clothing." Carbohydrate Polymers, 268, 118234.
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  6. National Institute for Occupational Safety and Health (NIOSH). (2022). NIOSH Recommended Practice for Occupational Protection from Novel Coronavirus (SARS-CoV-2) in the Workplace. Washington, DC: CDC.
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  8. Xu, L., et al. (2021). "Chitosan-based antimicrobial coatings for virus-resistant protective fabrics." Applied Surface Science, 545, 148967.
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