Metal-substitution strategy to control the conductive path in titanium dioxide: ab initio calculations Lei Li, Wenshi Li, Canyan Zhu and Ling-Feng Mao Eur. Phys. J. B, 91 5 (2018) 92 Published online: 30 May 2018 DOI: 10.1140/epjb/e2018-80544-8