If you use the GAP Corpus in your research, please cite the following paper:
The Group Affect and Performance Corpus, Braley and Murray, 2018.
@inproceedings{gapcorpus18, title={The Group Affect and Performance (GAP) Corpus}, author={Braley, McKenzie and Murray, Gabriel}, booktitle={Proceedings of the ICMI 2018 Workshop on Group Interaction Frontiers in Technology (GIFT)}, location={Boulder, CO}, year={2018},}