1. P.Berman, H.Karloff, G.Tardos, A competitive algorithm for three servers, in Proc. First Annual ACM-SIAM Symposium on Discrete Algorithms, 1990.
2. M.Chrobak, H.Karloff, T.Payne, S.Vishwanathan, New results on server problems, in Proc. First Annual ACM-SIAM Symposium on Discrete Algorithms, 1990.
3. M.Chrobak, L.Larmore, An optimal on-line algorithm for trees, to appear in SIAM J. Computing.
4. M.Chrobak, L.Larmore, A new approach to the server problem, submitted.
5. D.Coppersmith, P.G.Doyle, P.Raghavan, M.Snir, Random walks on weighted graphs and applications to on-line algorithms, manuscript.