@article{CTT100644479,
  author = {Hiromichi Ueno and Tsutomu Watanabe and Hideki Takayasu and Misako Takayasu},
  title = {Collective purchase behavior toward retail price changes},
  journal = {Physica A: Statistical Mechanics and its Applications},
  year = 2011,
}

@inproceedings{CTT100644465,
  author = {Misako Takayasu and Tsutomu Watanabe and Hideki Takayasu},
  title = {Econophysics Approaches to Large-Scale Bussiness Data and Financial Crisis},
  booktitle = {Econophysics Approaches to Large-Scale Business Data and Financial Crisis},
  year = 2010,
}