Mohamed Ali Aloulou Mikhail Y. Kovalyov Marie-Claude Portmann Maximization Problems in Single Machine Scheduling. 21-32 2004 129 Annals OR 1-4 http://dx.doi.org/10.1023/B:ANOR.0000030679.25466.02 db/journals/anor/anor129.html#AloulouKP04