E-print: http://arxiv.org/abs/1403.7763
E-print: http://arxiv.org/abs/1311.0810
E-print: http://arxiv.org/abs/1307.5319
E-print: http://arxiv.org/abs/1306.3110
E-print: http://arxiv.org/abs/1304.6819
E-print: http://arxiv.org/abs/1302.1405
E-print: http://arxiv.org/abs/1301.4939
E-print: http://arxiv.org/abs/1207.7308
E-print: http://arxiv.org/abs/1209.6171
E-print: http://arxiv.org/pdf/1209.0453.pdf
E-print: http://arxiv.org/abs/1204.0922
E-print: http://arxiv.org/abs/1206.2153
E-print: http://arxiv.org/abs/1201.052