@article{CTT100667804,
  author = {Kengo Oka and Masaichiro Mizumaki and Chika Sakaguchi and Alexandra  Sinclair and Clemens  Ritter and J. Paul Attfield and Masaki Azuma},
  title = {Intermetallic charge-transfer transition in Bi<sub>1</sub>−<sub>x</sub>La<sub>x</sub>NiO<sub>3</sub> as the origin of the colossal negative thermal expansion},
  journal = {PHYSICAL REVIEW B},
  year = 2013,
}