. & Stewart, K. (2001). Arsenic extraction and speciation in carrots using accelerated solvent extraction, liquid chromatography and plasma mass spectrometry, Analyst, 126, pp. 1011-1017.  Vela, N. & Heitkemper, D. (2004). Total arsenic determination and speciation in infant food products by ion chromatography-inductively coupled plasma-mass spectrometry, Journal of AOAC International, 87, pp. 244-252.  Vinogradov, A. (1959). The geochemistry of rare and dispersed chemical elements in soil, Consultants Bureau, New York 1959.