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E print: https://arxiv.org/abs/1804.09565
E print https://arxiv.org/abs/1702.08029
E print https://arxiv.org/abs/1702.03838
E print: arXiv:1511.07359v2
E print http://arxiv.org/abs/1407.3390
E-print: http://xxx.lanl.gov/abs/0903.2428v1