S. Singh Negi, Venugopalan, A. Thareparam, Raja, T., Singh, A. Pal, and Gopinath, C. S., ?Green chemistry approach to styrene from ethylbenzene and air on MnxTi1-xO2 catalyst?, RSC Advances, vol. 4, no. 100, pp. 57087-57097, 2014.