E-print: http://arxiv.org/abs/physics/0508104
E-print: http://arxiv.org/abs/physics/0512090
E-print: http://arxiv.org/abs/1404.4798
E-print: http://ssrn.com/abstract=2777657
E-print: https://arxiv.org/abs/1708.00644
E-print: https://ssrn.com/abstract=3070850
E-print: https://arxiv.org/abs/1807.11751