Garg, Sapana, J.K. Narwal, and K.K. Verma. 2012. “Study on Some Hydroxyaryltellurium(IV) Trichlorides Catalyzed Knoevenagel Reactions”. Asian Journal of Chemistry 24 (12):5619-21. https://asianpubs.org/index.php/ajchem/article/view/9963.