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Received: 2 July 1999/Accepted: 16 November 1999
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Rai, U., Tripathi, R., Singh, N. et al. Amelioration of Fly-Ash by Selected Nitrogen Fixing Blue Green Algae. Bull. Environ. Contam. Toxicol. 64, 294–301 (2000). https://doi.org/10.1007/s001289910043