I strongly prefer links to the abstract: http://arxiv.org/abs/1103.4282v2 http://arxiv.org/abs/1103.4282v2 This lets you: (a) read the abstract before deciding

I strongly prefer links to the abstract: http://arxiv.org/abs/1103.4282v2 http://arxiv.org/abs/1103.4282v2 This lets you: (a) read the abstract before deciding whether or not to read the paper (b) easily find earlier (or later) versions of the paper (c) easily search for other papers the authors have on the arxiv.