Bhujel, A. et al. 2021. Utilization of Charred Water Hyacinth (Jalkumvi) as Biosorbent for Removal of Ca(II) Ion from Aqueous Solution. Journal of Nepal Chemical Society. 42, 1 (Mar. 2021), 107–114. DOI:https://doi.org/10.3126/jncs.v42i1.35360.