Kuula, M., Stam, A. <https://pure.iiasa.ac.at/view/iiasa/1588.html>, Leino, S., Ranta, J., & Wallenius, J.  (1999).  Workload balancing in the manufacturing environment: A multicriteria trade-off analysis.   International Journal of Production Research 37 (7) 1459-1477. 10.1080/002075499191085 <https://doi.org/10.1080/002075499191085>.