Dominique de Werra Jacek Blazewicz Wieslaw Kubiak A preemptive open shop scheduling problem with one resource. 9-15 1991 10 Oper. Res. Lett. 1 https://doi.org/10.1016/0167-6377(91)90080-9 https://www.wikidata.org/entity/Q57387909 db/journals/orl/orl10.html#WerraBK91