1. Line Planning and Connectivity;Borndörfer,2013
2. Optimal schedules for periodically recurring events;Burkard;Discrete Appl. Math.,1986
3. Computers and Intractability: A Guide to the Theory of NP- Completeness;Garey,1979
4. Line planning with user-optimal route choice;Goerigk;European J. Oper. Res.,2017
5. Models and Algorithms for Railway Line Planning Problems;Goossens,2004