Bercher, P., and C. Olz. “POP ≡ POCL, Right? Complexity Results for Partial Order (Causal Link) Makespan Minimization”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 34, no. 06, Apr. 2020, pp. 9785-93, doi:10.1609/aaai.v34i06.6530.