Garg, Sapana, et al. “Study on Some Hydroxyaryltellurium(IV) Trichlorides Catalyzed Knoevenagel Reactions”.
Asian Journal of Chemistry
, vol. 24, no. 12, Aug. 2012, pp. 5619-21, https://asianpubs.org/index.php/ajchem/article/view/9963.