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Structure of the superconducting gap in MgB2 from point-contact spectroscopy, Y Bugoslavsky, Y Miyoshi, G K Perkins, A V Berenov, Z Lockman, J L MacManus-Driscoll, L F Cohen, A D Caplin, H Y Zhai, M P Paranthaman, H M Christen, M Blamire
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Bugoslavsky et al. (2002) studied this question.
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