Schuur, Petra, and Gerhard J. Woeginger. “A PTAS for Single Machine Scheduling With Controllable Processing Times”. Acta Cybernetica 15, no. 3 (January 1, 2002): 369-378. Accessed November 22, 2024. https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3586.