@inproceedings{CTT100626883,
  author = {Tongfang Xie and Masao Murota and Satoru Shoji},
  title = {A Study on Quantitative Evaluation for Soccer Tactics Using Defense Strength Map},
  booktitle = {WCSF 2011 Football Science},
  year = 2011,
}

@inproceedings{CTT100626881,
  author = {謝トウ放 and 室田真男},
  title = {守備強度マップを利用したサッカー戦術の定量的評価方法の検討},
  booktitle = {日本フットボール学会 8th Congress妙録集},
  year = 2010,
}