De Werra, D. and J. Blazewicz, Some preemptive open shop scheduling problems with a renewable or a nonrenewable resource, Discrete Applied Mathematics 35 (1992) 205-219. An edge coloring model is presented for a preemptive open shop problem. Constraints generated by a single resource have to be taken into account. The case of a renewable and of a nonrenewable resource as considered. Since the e...