TY - JOUR AU - William Kelly AU - L. Barker C2 - Energy and Fuels DA - 2007-10-01 LA - en M1 - 22 PB - Energy and Fuels PY - 2007 TI - Determination of Sulfur in Biodiesel and Petroleum Diesel by X-Ray Fluorescence (XRF) Using the Gravimetric Standard Addition Method-II ER -