Jing, L.Q., Xin, B.F., Yuan, F.L., Xue, L.P., Wang, B.Q. and Fu, H.G. (2006) Effects of surface oxygen vacancies on photophysical and photochemical processes of Zn-Doped TiO2 nanoparticles and their relationships. The Journal of Physical Chemistry B, 110, 17860-17865.