Lệ, N.T.N., Thụ, L.N. and Tám, L.V. 2012. Complexation between (benzoic acid)(AZO)phenylcalix[4]arene (BPC) with lead and its analytical application. Vietnam Journal of Chemistry. 48, 1 (Aug. 2012). DOI:https://doi.org/10.15625/1982.