Danzinger, P., T. Geibinger, F. Mischek, and N. Musliu. “Solving the Test Laboratory Scheduling Problem With Variable Task Grouping”. Proceedings of the International Conference on Automated Planning and Scheduling, vol. 30, no. 1, June 2020, pp. 357-65, https://ojs.aaai.org/index.php/ICAPS/article/view/6681.