M. Rao Bevara, Bhongale, S. Sitaram, Bhosle, S. Madhavrao, Chavan, N., Chelanattukizhakkemadath, R. Rajan, Deokar, S. Babasaheb, Dhoble, D. Arun, Dwivedi, M., Ghorpade, R. V., Harikrishna, R., Dhanasekharan, J., John, A., Locanindi, H. Sarvothama, Momin, M. Shamshuddi, Mulani, K. Baban, Mule, S. Atmaram, Nalawade, A. Chetan, Punitharasu, V., Qureshi, M. Shadbar, Kumar, T. Rajiv, Shaikh, W. Abdul Late, Sontakke, K. Vishwanath, Reddy, K. Mohan Srin, Sriperambudur, R. Kumar, and Ponrathnam, S., ?Ethyl oligo-silicates with strong acid heterogeneous polymeric catalysts?, U.S. Patent PCT/IB2011/0025312012.