@article{CTT100668094,
  author = {Kengo Oka and Koichiro Nabetani and Chika Sakaguchi and Hayato Seki and Michel  Czapski and Yuichi Shimakawa and Masaki Azuma},
  title = {Tuning negative thermal expansion in Bi<sub>1</sub>-<sub>X</sub>Ln<sub>X</sub>NiO<sub>3</sub>(Ln=La,Nd,Eu,Dy)},
  journal = {APPLIED PHYSICS LETTERS},
  year = 2013,
}