Romanuke, V. V. “Infinity Substitute in Exactly Minimizing Total Tardiness in Tight-Tardy Progressive 1-Machine Scheduling by Idling-Free Preemptions of Equal-Length Jobs”. Bulletin of V.N. Karazin Kharkiv National University, Series «Mathematical Modeling. Information Technology. Automated Control Systems», Vol. 44, Dec. 2019, pp. 94-101, doi:10.26565/2304-6201-2019-44-10.