Li W, Bian W, Wang L. Sulfonic-Acid-Functionalized Silica Catalyzed, Facile and Efficient Method for the Synthesis of Aryl-14H-dibenzo[a,i]xanthenes. ajc [Internet]. 2013 Sep. 10 [cited 2024 Jul. 5];25(15):8289-91. Available from: https://asianpubs.org/index.php/ajchem/article/view/25_16_11