Wadhwa, Sham K., 		Kazi, Tasneem Gul, 		Tuzen, Mustafa, 		Afridi, Hassan Imran, 		Khan, Naeemullah, AND 		Brahman, Kapil Dev.
"Application of Polyhydroxybutyrate-b-polyethyleneglycol    (a block co-polymer) for Solid Phase Extraction of Lead and Copper in Different Food Samples" <em>Pakistan Journal of Analytical &amp; Environmental Chemistry</em> [Online], Volume 15 Number 1 (1 December 2014)