S. J. Mahboob, M. I. Subhopoto, R. Dewani, M. K. Pervez, and F. Nazir, “A New Process for the Synthesis of Naphthalene Based Tanning Agent: Naphthalene Based Tanning Agent”, Pakistan Journal of Scientific & Industrial Research, vol. 53, no. 4, pp. 230–232, Jun. 2010.