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2. https://www.intechopen.com/books/advances-in-microfluidic-technologies-for-energy-and-environmental-applications/application-of-microfluidics-in-biosensors 2020
3. http://www.wepa-db.net/policies/law/laos/standards.htm 2021
4. https://www.ncbi.nlm.nih.gov/books/NBK442375/ 2017
5. https://www.who.int/news-room/fact-sheets/detail/drinking-water 2019