A. P.  Bhirud, Sathaye, S. D., Waichal, R. P., Nikam, L. K., and Kale, B. B., ?Eco-friendly, highly stable and efficient nanostructured p-type N-doped ZnO photocatalyst for environmentally benign solar hydrogen production?, Green Chemistry, vol. 14, no. 10, pp. 2790-2798, 2012.

S. K.  Apte, Garaje, S. N., Naik, S. D., Waichal, R. P., and Kale, B. B., ?Environmentally benign enhanced H-2 production from abundant copious waste H2S using size tuneable cubic bismuth (Bi-0) quantum dots-GeO2 glass photocatalyst under solar light?, Green Chemistry, vol. 15, no. 12, pp. 3459-3467, 2013.