M. Abdallah, Shadia, et al. “Condensation of (E)-5-Aryl-3-Arylmethylene-2-(3H)- Furanones With Different Amines ”.
Asian Journal of Chemistry
, vol. 15, no. 2, Mar. 2010, pp. 601-15, https://asianpubs.org/index.php/ajchem/article/view/21685.