E print https://arxiv.org/abs/1707.01457
E print: arXiv:cond-mat/9909245
E print: arXiv:1503.06704
E print http://arxiv.org/abs/1207.7308
E print https://arxiv.org/abs/1706.04163
E print https://arxiv.org/abs/1702.03838
E print http://arxiv.org/abs/1307.5319
E print: arXiv:cond-mat/0504079
E-print: http://xxx.lanl.gov/abs/0710.0802
E-print: http://arxiv.org/abs/1602.03043
E print: arXiv:cond-mat/0204047