2Hardin J R, Nemhauser G L. Strong valid inequalities for the resource-constrained scheduling problem with uniform resource requirements[J]. Discrete Optimization, 2008, 5(1): 19-35.
3Gu W, Zhang J. Research on car sequencing based on improved ant colony optimization[J]. Machinery, 2008, 532(46): 10-13.
4Mercier L, van Hentenryck P. Strong polynomiality of resource constraint propagation[J]. Discrete Optimization, 2007, 4(3/4): 288-314.