Alharthi, A.I. 2019. Efficient Catalytic Performance of Calcined Tungstophosphoric Acid for the Claisen-Schmidt Condensation under Solvent-Free Reaction. Asian Journal of Chemistry. 31, 11 (Sep. 2019), 2579–2584. DOI:https://doi.org/10.14233/ajchem.2019.22219.