S.  Singh, Britto, V. D., Bharde, A. A., Sastry, M., Dhawan, A., and Prasad, B. L. V., ?Bacterial synthesis of phtocatalytically active and biocompatible TiO2 and ZnO nanoparticles?, International Journal of Green Nanotechnology: Physics and Chemistry, vol. 2, no. 2, pp. 80-99, 2010.