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Lua i Stíl Chicago (17ú heag.)Chen, G. H. Biological Wastewater Treatment: Principles, Modelling and Design. London, United Kingdom: IWA Publishing, 2020.
Lua MLA (9ú heag.)Chen, G. H. Biological Wastewater Treatment: Principles, Modelling and Design. IWA Publishing, 2020.
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