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A. D. N. Giorgi "Response of periphyton biomass to high phosphorus concentrations in laboratory experiments"
Bulletin of Environmental Contamination and Toxicology, 1995, 825-832
http://dx.doi.org/10.1007/BF00209460
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Bee honey as environmental indicator for pollution with heavy metals
M. N. Rashed; M. T. A. El-Haty; S. M. Mohamed
Toxicological & Environmental Chemistry, 1029-0486, Volume 91, Issue 3, 2009, Pages 389 – 403
http://dx.doi.org/10.1080/02772240802294870
