@InProceedings{MasahikoItoh:2016, author = {Masahiko Itoh, Naoki Yoshinaga, and Masashi Toyoda}, title = {Word-Clouds in the Sky: Multi-layer Spatio-temporal Event Visualization from a Geo-parsed Microblog Stream}, booktitle = {the 20th International Conference on Information Visualization (IV2016)}, year = {2016}, pages = {282-289}, }