Yes and getting even more off topic, this latest mixnet paper talks about using the Directory Authority system to report and vote about link performance to mitigate n-1 attacks:
[MIRANDA] Leibowitz, H., Piotrowska, A., Danezis, G., Herzberg, A., 2017, "No right to ramain silent: Isolating Malicious Mixes"
oops i meant to paste the url to the paper:
https://eprint.iacr.org/2017/1000.pdf
because it's another really great paper