The effect of heavy metals on a thermophilic methanogenic upflow sludge blanket reactor.
I. R. Leighton and C. F. Forster
Bioresource Technology
Volume 63, Issue 2, February 1998, Pages 131-137
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http://dx.doi.org/10.1016/S0960-8524(97)00107-7D.P. Modak, K.P. Singha, H. Chandraa and P.K. Raya
Water Research
Volume 26, Issue 11, November 1992, Pages 1541-1548
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http://dx.doi.org/10.1016/0043-1354(92)90075-F