Agnihotri, N., S. Akhtar, P. Rathi, and N. Kaur. 2018. “Extraction, Spectrophotometric Determination of Tungsten(VI) With 3-Hydroxy-2-[1′-Phenyl-3′-(p-Methylphenyl)-4’-Pyrazolyl]-4-Oxo-4H-1-Benzopyran As Chelating Agent and Its in Situ Computational Studies”. Asian Journal of Chemistry 31 (2):275-78. https://doi.org/10.14233/ajchem.2019.21553.