“Evaluation of the Three-Stage BCR (European Community Bureau of Reference) Sequential Extraction Procedure to Assess the Potential Mobility and Toxicity of Heavy Metals in Roadside Soils”. 2006. Biological Sciences - PJSIR 49 (3): 181-88. https://www.v2.pjsir.org/index.php/biological-sciences/article/view/1146.