@article{CTT100714404,
  author = {T. Ono and H. Tanaka and Y. Shirata and A. Matsuo and K. Kindo and F. Ishikawa and O. Kolomiyets and H. Mitamura and T. Goto and H. Nakano and N. A. Fortune and S. T. Hannahs and Y. Yoshida and Y. Takano},
  title = {Magnetic-Field Induced Quantum Phase Transitions in Triangular-Lattice Antiferromagnets},
  journal = {J. Phys: Conf. Ser.},
  year = 2011,
}

@article{CTT100631013,
  author = {Shojiro Kimura and Hirofumi Ishikawa and Y. Inagaki and M. Yoshida and S. Okubo and H. Ohta and H. nojiri and A.A. Belik and M. Azuma and M. Takano},
  title = {ESR Measurements on One-Dimensional Quantum Ferrimagnets A3Cu3(PO4)4 with A=Sr and Ca in Submillimeter-Wave Region},
  journal = {J. Phys. Soc. Jpn.},
  year = 2006,
}