Kumar, Alok, Sarita Tripathi, and B.P. Yadav. 2010. “Ab-Initio Molecular Orbital and DFT Studies on the Effect of Methyl Group Perturbations in Isoxazoles and Thiazoles”. Asian Journal of Chemistry 18 (4):2458-62. https://asianpubs.org/index.php/ajchem/article/view/20600.