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  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},
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  year = 2011,
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@article{CTT100617350,
  author = {Kaoru Miura and Makoto Kubota and Masaki Azuma and HIROSHI FUNAKUBO},
  title = {Electronic, Structural, and Piezoelectric Properties of BiFe1-xCoxO3},
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}