“…They provide plynomial-time and pseudo-polynomial-time algorithms to solve problems involving various combinations of some regular objective functions when the job families are either incompatible or compatible. Fan, Cheng, Li, and Feng (2013) consider two-agent scheduling on a common bounded parallelbatching machine, where the objective is to minimize the makespan or total completion time of one agent, subject to an upper bound on the makespan of the other agent. They show that the makespan problem is polynomially solvable for the incompatible case and is NP-hard in the ordinary sense for the compatible case, and that the total completion time problem is NP-hard and is polynomially solvable for the incompatible case with a fixed number of job types.…”