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Matsunaga, N., Kawadu, T., Nishiyama, S., Nagayama, T., Kobayashi, N., Tamura, M., Bono, G., Feast, M. W. & Nagata, T.
¡°Three classical Cepheid variable stars in the nuclear bulge of the Milky Way¡±
Nature, published online on 24 August 2011. doi: 11.1038/nature10359