6Barros L. The optimisation of repair decisions using life cycle cost parameters[J]. Institute for Mathematics and Its Applications Journal, 1998, 9(4): 403-413.
7Barros L, Riley M. A combinatorial approach to level of repair analysis[J]. European Journal of Operational Research, 2000, 129: 242-251.
8Gutina G, Rafieya A, Yeo A. A graph-theoretical approach to level of repair analysis [EB/OL]. [2007-11-28]. http: //www. optimization-online. org/DB_ FILE/ 2004/08/945. pdf
9Gutina G, Rafieya A, Yeo A, et al. Level of repair analysis and minimum cost homomorphisms of graphs [J]. Dis crete Applied Mathematics, 2006, 154(6): 881-889.
10Saranga H, Kumar U D. Optimization of aircraft maintenance/support infrastructure using genetic algorithms-level of repair analysis [J]. Ann Oper Res, 2006,143:91-106.
