1. E. Beltrami and L. Bodin, ?Networks and vehicle routing for municipal waste collection?,Networks 4 65?94 (1974).
2. H. Stern and M. Dror, ?Routing electric meter readers?,Computers Ops Res. 6, 209?223 (1979).
3. E. Benavent, V. Campos, A. Corber�n and E. Mota, E., ?Problemas de rutas por arcos?,Q�estii� 7, num. 3, 479?490 (1983) (in Spanish).
4. L. Levi and L. Bodin, ?Scheduling the postal carriers for the United States Postal Service: an application of arc partitioning and routing?, in B. L. Golden and A. A. Assad (eds.),Vehicle Routing: Methods and Studies, 359?394 (1988).
5. L. Bodin, B.L. Golden, A.A. Assad and M. Ball, ?Routing and scheduling of vehicles and crews: the state of the art?,Computers Ops Res. 10, 63?211 (1983).