Sham K. Wadhwa et al.trans. 2014. Application of Polyhydroxybutyrate-b-polyethyleneglycol (a block co-polymer) for Solid Phase Extraction of Lead and Copper in Different Food Samples. Pakistan Journal of Analytical & Environmental Chemistry. 15, 1 (Jun. 2014), 66–73. DOI:https://doi.org/10.21743/.