الإتاحة: https://doi.org/10.1103/PhysRevD.76.052003Testhttp://eprints.hud.ac.uk/id/eprint/14183Test/
الإتاحة: https://doi.org/10.1103/PhysRevLett.97.191801Testhttp://eprints.hud.ac.uk/id/eprint/14184Test/https://eprints.hud.ac.uk/id/eprint/14184/1/Bungau0607088v2.pdfTest