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Shah, V.K.G.; Dunstan, H.; Taylor, W., An efficient diethyl ether-based soxhlet protocol to quantify faecal sterols from catchment waters, J. Chromatogr. A, 2006, 1108, 1, 111-115, https://doi.org/10.1016/j.chroma.2005.12.084 . [all data]