Xiao, Z., H. Wan, H. H. Zhuo, A. Herzig, L. Perrussel, and P. Chen. “Refining HTN Methods via Task Insertion With Preferences”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 34, no. 06, Apr. 2020, pp. 10009-16, doi:10.1609/aaai.v34i06.6557.