@article{CTT100631983,
  author = {Yoshitaka Nakamura and M. Kawai and Masaki Azuma and Makoto Kubota and M. Shimada and Toshiaki Aiba and Yuichi Shimakawa},
  title = {Rhombohedral-tetragonal structural change and enhanced piezoelectric constant in (1-x)BiFeO3-xBiCoO3 thin films},
  journal = {IOP Conf. Series: Materials Science and Engineering},
  year = 2011,
}

@article{CTT100631988,
  author = {Yoshitaka Nakamura and Masanori Kawai and Masaki Azuma and Makoto Kubota and M. Shimada and Toshiaki Aiba and Yuichi Shimakawa},
  title = {Enhanced Piezoelectric Constant of (1- x)BiFeO3–xBiCoO3 Thin Films Grown on LaAIO3 Substrate},
  journal = {Jpn. J. Appl. Phys.},
  year = 2011,
}