Vadim Romanuke 2021. Infinity Substitute in Finding Exact Minimum of Total Weighted Tardiness in Tight-Tardy Progressive 1-machine Scheduling by Idling-free Preemptions. Statistics, Optimization & Information Computing. 9, 4 (Aug. 2021), 820-837. DOI:https://doi.org/10.19139/soic-2310-5070-1256.