E print http://arxiv.org/abs/1412.7108!
E print http://arxiv.org/PS_cache/arxiv/pdf/1009/1009.2928v1.pdf
E print: http://arxiv.org/pdf/1601.04478v1
E print: arXiv:1206.2153
E print http://xxx.lanl.gov/abs/1309.5806
E print http://arxiv.org/pdf/1009.1100.pdf
E print: arXiv:cond-mat/0101120
E print http://arxiv.org/abs/0904.0900
E print https://arxiv.org/abs/1702.08029
E print: arXiv:cond-mat/0204047
E-print: http://arxiv.org/abs/1602.03043
E-print: http://xxx.lanl.gov/abs/0710.0802
E print: arXiv:cond-mat/0504079
E print http://arxiv.org/abs/1307.5319
E print https://arxiv.org/abs/1702.03838
E print https://arxiv.org/abs/1706.04163