Castorina, F., and U. Masi. “COMPARISON OF Sr ISOTOPIC RATIOS FROM TWO SOILS NEAR RAVENNA (ITALY) USING AQUA REGIA AND TWO-STEP SEQUENTIAL EXTRACTS”. EQA - International Journal of Environmental Quality, vol. 4, no. 4, Jan. 2010, pp. 7-14, doi:10.6092/issn.2281-4485/3796.