4Tang Qunhong,Wilson S R, Perevalov E. An Approximation Manpower Planning Model for After-sales Field Service Sup- port[J]. Computers& Operations Research, 2008,35 ( 11 ) 3 479-3 488.
5Caramia M,Giordani S. A New Approach for Scheduling In- dependent Tasks with Multiple Modes[J]. Journal of Heuris- tics,2009,15(4) :313-329.
6Bellenguez O,Neron E. Lower Bounds for the Multi-skill Pro- ject Scheduling Problem with hierarchical levels of skills[J]. Lecture Notes in Computer Science,2005,36(16) :229-243.
7Moustafa Elshafei HeshamK Alfares. A Dynamic Programming Algorithm for Days-off Scheduling with Sequence Dependent La- bor Costs[J]. Journal of Scheduling, 2008,11 (2) : 85-93.
8Zhu Z W, Heady R B. Minimizing the Sum of Earliness/tardi ness in Multi-machine Scheduling:A Mixed Integer Program- ming Approach [J]. Computers &Industrial Engineering, 2000,38(2) :297-315.
9Gao Jie,Sun Linyan,Gen Mitsuo. A Hybrid Genetic and Vari- able Neighborhood Descent Algotithm for Flexible Job Shop Scheduling Problems[J]. Computers & Operations Research, 2008,35(9) :2 892-2 907.
10Mati Y,Rezg N,Xie X. An Integrated Greedy Heuristic for a Flexible Job Shop Scheduling Problem[C]//IEEE Interna- tional Conference on Systems, Man and Cybernetics, 2001, (4):2 534-2 539.