Bhattacharjya, Debarun, Tian Gao, and Dharmashankar Subramanian. 2021. “Ordinal Historical Dependence in Graphical Event Models With Tree Representations”. Proceedings of the AAAI Conference on Artificial Intelligence 35 (8):6759-67. https://doi.org/10.1609/aaai.v35i8.16835.