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, Pakistan, v. 15, n. 1, p. 66–73, 2014. DOI: 10.21743/. Disponível em: http://pjaec.pk/index.php/pjaec/article/view/344. Acesso em: 12 jul. 2025.