TY - JOUR A1 - Bugalho, M. N. A1 - Barcia, P. A1 - Caldeira, M. C. A1 - Cerdeira, J. O. T1 - Stable isotopes as ecological tracers: an efficient method for assessing the contribution of multiple sources to mixtures JO - Biogeosciences J1 - BG VL - 5 IS - 5 SP - 1351 EP - 1359 Y1 - 2008/09/25 PB - Copernicus Publications SN - 1726-4170 UR - http://www.biogeosciences.net/5/1351/2008/ L1 - http://www.biogeosciences.net/5/1351/2008/bg-5-1351-2008.pdf ER -