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[2] F.R. Klinkhamer, “Exotic physics: Antigravity?,” talk at the workshop Exotic Physics with Neutrino Telescopes 2013, Marseille, 3-5 April 2013; available from https://indico.in2p3.fr/event/7381/contributions/41673/attachments/33518/41306/ marseille_05apr2013.pdf

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