@article{CTT100714425,
  author = {I. Umegaki and H. Tanaka and T. Ono and M. Oshikawa and Kazumitsu Sakai},
  title = {Thermodynamic properties of quantum sine-Gordon spin chain system KCuGaF6},
  journal = {Phys. Rev. B},
  year = 2012,
}