@article{CTT100627792,
  author = {Y. Kohsaka and T. Hanaguri and Kohichi Kitazawa and M. Azuma and M. Takano and H. Takagi},
  title = {Real Space Imaging of the Electronic States in Underdoped Ca2-xNaxCuO2Cl2 Single Crystals},
  journal = {Journal of Low Temperature Physics,},
  year = 2003,
}

@article{CTT100627796,
  author = {Y. Kohsaka and T. Hanaguri and K. Kitazawa and M. Azuma and M. Takano and H. Takagi},
  title = {STM/STS Study on Ca2-xNaxCuO2Cl2 Single Crystals},
  journal = {Physica C,},
  year = 2003,
}