Wei, Y., W. Li, Y. Fan, L. Xu, M.-C. Chang, and S. Lyu. “3D Single-Person Concurrent Activity Detection Using Stacked Relation Network”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 34, no. 07, Apr. 2020, pp. 12329-37, doi:10.1609/aaai.v34i07.6917.