Amotz Bar-Noy Allan Borodin Mauricio Karchmer Nathan Linial Michael Werman Bounds on Universal Sequences. 268-277 1989 18 SIAM J. Comput. 2 db/journals/siamcomp/siamcomp18.html#Bar-NoyBKLW89 http://dx.doi.org/10.1137/0218018