The submitted url is to the old version of this paper and should be changed. http://arxiv.org/abs/1503.08776 http://arxiv.org/abs/1503.08776 With arxiv.org, i

The submitted url is to the old version of this paper and should be changed. http://arxiv.org/abs/1503.08776 http://arxiv.org/abs/1503.08776 With arxiv.org, it's always best to link to the abstract page rather than the PDF since the abstract page will show all available versions. It also gives people chance to read the abstract before deciding to download the paper.