Lerche, J., Neve, H., Wandahl, S., & Gross, A. (2020). Continuous Improvements at Operator Level. Journal of Engineering, Project, and Production Management, 10(1), 64-70. https://doi.org/10.2478/jeppm-2020-0008
LEMMA, M., & TESSEMA, G. (2000). ABEL-TYPE WEIGHTED MEANS TRANSFORMATIONS INTO ℓ. International Journal of Mathematics and Mathematical Sciences, 2000(), 197-204-025. https://doi.org/10.1155/S0161171200003811