S. SAFI, ZAKI, and HUSSEIN M. ALHENDAWI. “Tautomerization and Substituent Effects on the Intramolecular Hydrogen Bonding in 4-Formyl-1-Methylpyrazol-5-Ol A Density Functional Theory”. Asian Journal of Chemistry 21, no. 6 (March 30, 2010): 4772–4784. Accessed June 30, 2024. https://asianpubs.org/index.php/ajchem/article/view/18229.