@Article{MasahikoItoh:2016,
  author = {Masahiko Itoh, Daisaku Yokoyama, Masashi Toyoda, Yoshimitsu Tomita, Satoshi Kawamura, Masaru Kitsuregawa},
  title = {Visual Exploration of Changes in Passenger Flows and Tweets on Mega-City Metro Network},
  booktitle = {IEEE Transactions on Big Data},
  year      = {2016},
  publisher = {IEEE},
  pages     = {85-99},
}