Possible metallization of the Mott insulators TiOCl and TiOBr: Effects of doping and external pressureC.A. Kuntscher, M. Klemm, S. Horn, M. Sing and R. ClaessenEur. Phys. J. Special Topics, 180 (2009) 29-42DOI: https://doi.org/10.1140/epjst/e2010-01210-7