@inproceedings { SKS18a, title = {Understanding Collective Behavior with the Concept of Core Clusters}, booktitle = {VGI Geovisual Analytics Workshop, 4th International Symposium on Big Data Visual and Immersive Analytics (BDVA 2018)}, year = {2018}, author = {Seebacher, Daniel and Keim, Daniel A. and Stein, Manuel} }