@inproceedings{oai:nitech.repo.nii.ac.jp:00003394,
 author = {Matsushima, Hiroshi and Inuzuka, Nobuhiro},
 book = {Smart Innovation, Systems and Technologies　(Intelligent Decision Technologies)},
 month = {May},
 note = {application/pdf},
 pages = {303--312},
 publisher = {Springer},
 title = {Evolution of Friendship Networks and Transition of Their Properties},
 volume = {16},
 year = {2012}
}