Saha, M.; Palma, B. S.; Saha, D.; Alam, M. Z.; Azim, M. A.; Chowdhury, A. S.; Kamruzzaman, M. Indanylation of Phenol With Indene in the Presence of Benzenesulphonic Acid. Dhaka Univ. J. Sci. 2012, 60, 93-96.