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APA Citation
Khadem, A. F., Azman, S., Plugge, C. M., Zeeman, G., van Lier, J. B., & Stams, A. J. (n.d.). effect of humic acids on the activity of pure and mixed methanogenic cultures. Biomass and bioenergy, 99, 21–30. http://access.bl.uk/ark:/81055/vdc_100045163389.0x000027