@inproceedings { BvA+11a, title = {Interactive analysis of object group changes over time}, booktitle = {Proc. EuroVA International Workshop on Visual Analytics}, note = {Peer-reviewed short paper}, organization = {Eurographics}, pages = {41 -- 44}, year = {2011}, author = {Bremm, Sebastian and von Landesberger, Tatiana and Andrienko, Gennady and Andrienko, Natalia and Schreck, Tobias} }