Bond, P. L., Erhart, R., Wagner, M., Keller, J., & Blackall, L. L. (1999). Identification of Some of the Major Groups of Bacteria in Efficient and Nonefficient Biological Phosphorus Removal Activated Sludge Systems. American Society for Microbiology (ASM).

Bond, Philip L., Robert Erhart, Michael Wagner, Jürg Keller, i Linda L. Blackall. Identification of Some of the Major Groups of Bacteria In Efficient and Nonefficient Biological Phosphorus Removal Activated Sludge Systems. American Society for Microbiology (ASM), 1999.

Bond, Philip L., et al. Identification of Some of the Major Groups of Bacteria In Efficient and Nonefficient Biological Phosphorus Removal Activated Sludge Systems. American Society for Microbiology (ASM), 1999.