E print: http://arxiv.org/pdf/1601.04478v1
E print: arXiv:1511.07359v2
E-print: http://lanl.arxiv.org/abs/1509.07710
E print: arXiv:1508.00275v2
E print: arXiv:1506.03758
E print: arXiv:1503.06704
E print http://arxiv.org/abs/1502.06736!
E print http://xxx.lanl.gov/abs/1501.00434
E print http://arxiv.org/abs/1412.7108!
E print http://xxx.lanl.gov/abs/1412.0141
E print http://arxiv.org/abs/1310.5114
E print http://arxiv.org/abs/1409.3296
E print http://xxx.lanl.gov/abs/1406.5022