CHAPTER Gatica-Perez_CAMBRIDGEUNIVERSITYPRESS_2014/IDIAP Analysis of Small Groups Gatica-Perez, Daniel Aran, Oya Jayagopi, Dinesh Babu Social Signal Processing 2017 Cambridge University Press. Editors J. Burgoon, N. Magnenat-Thalmann, M. Pantic, and A. Vinciarelli 349-367 10.1017/9781316676202.025 doi