@article{CTT100627435,
  author = {T. Hanaguri and C Lupien and yuhki Kohsaka and D.-H. Lee and M. Azuma and M. Takano and H. Takagi and J.C.  Davis},
  title = {A 'Checkerboard' Electronic Crystal State in Lightly Hole-Doped Ca2-xNaxCuO2Cl2},
  journal = {Nature,},
  year = 2004,
}