Sharma, Harish, et al. “Biosorptive Removal of Cu(II), Cd(II) and Pb(II) Ions from Synthetic Wastewater Using Low Cost Biosorbent (Pyras pashia): Thermodynamic and Equilibrium Studies”. Asian Journal of Chemistry, vol. 32, no. 4, Feb. 2020, pp. 727-32, doi:10.14233/ajchem.2020.22372.