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1. Technical guide on biological nutrient removal : the phoredox process / M. J. N. P. Simpkins, A. GerberPublication: Pretoria : 1981, Council for Scientific and Industrial ResearchDescription: V, 20 p. : il. ; 30 cmAvailability: Items available for loan: Biblioteca de Algés[03250-S] (1).

2. Technical guide on biological nutrient removal : the phoredox process / M. J. N. P. Simpkins, A. GerberPublication: Pretoria : 1981, Coucil for Scientific and Industrial ResearchDescription: v, 20 p. : il. ; 30 cmAvailability: Items available for loan: Biblioteca de Algés[03250-S] (1).

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