Zhou, T., C.-Y. Lin, I. King, M. R. Lyu, Y.-I. Song, and Y. Cao. “Learning to Suggest Questions in Online Forums”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 25, no. 1, Aug. 2011, pp. 1298-03, doi:10.1609/aaai.v25i1.8091.