Chrpa, L., M. Vallati, and T. McCluskey. “MUM: A Technique for Maximising the Utility of Macro-Operators by Constrained Generation and Use”. Proceedings of the International Conference on Automated Planning and Scheduling, vol. 24, no. 1, May 2014, pp. 65-73, doi:10.1609/icaps.v24i1.13626.