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S.I.A.M.
doi.org/10.1137/050626259
SIAM Journal on Discrete Mathematics
Networks and Optimization

Hurkens, C., Keijsper, J. C. M., & Stougie, L. (2007). Virtual private network design: a proof of the tree routing conjecture on ring networks. SIAM Journal on Discrete Mathematics, 21(2), 482–503. doi:10.1137/050626259