1. ISO 5498:1981
Agricultural food products -- Determination of crude fibre content -- General method
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http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=11544Animal feeding stuffs -- Determination of calcium content -- Part 1: Titrimetric method
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http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=12861