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APA Citation
Institution,, B. S. (2020). Soil, treated biowaste, sludge and waste. Digestion with a hydrochloric (HCl), nitric (HNO3 ) and tetrafluoroboric (HBF4 ) or hydrofluoric (HF) acid mixture for subsequent determination of elements.. London : British Standards Institution. http://access.bl.uk/ark:/81055/vdc_100109605633.0x000001