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Kapu, M.M., Ipaye, M.M., Ega, R.A.I. et al. Lichens as bioindicators of aerial fallout of heavy metals in Zaria, Nigeria. Bull. Environ. Contam. Toxicol. 47, 413–416 (1991). https://doi.org/10.1007/BF01702203
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DOI: https://doi.org/10.1007/BF01702203