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2020. Preparation and characterization of p-sulfonated calix[4]arene functionalized chitosan hydrogel beads and their preliminary adsorption study towards removal of lead(II) and zinc(II) ions. Malaysian Journal of Fundamental and Applied Sciences. 16, 4 (Aug. 2020), 429–432. DOI:https://doi.org/10.11113/mjfas.v16n4.1765.