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Superconducting gap symmetry of Ba0.6K0.4Fe2As2 studied by angle-resolved photoemission spectroscopy, Nakayama, K., Sato, T., Richard, P., Xu, Y.-M., Sekiba, Y., Souma, S., Chen, G. F., Luo, J. L., Wang, N. L., Ding, H., Takahashi, T.
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Nakayama et al. (2009) studied this question.
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