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title = {{Gravity modes as a way to distinguish between hydrogen- and helium-burning red giant stars}},  journal = {Nature},  }  @article{Beck_2011,  doi = {10.1038/nature10612},  url = {http://dx.doi.org/10.1038/nature10612},  year = {2011},  month = {dec},  publisher = {Nature Publishing Group},  volume = {481},  number = {7379},  pages = {55--57},  author = {Paul G. Beck and Josefina Montalban and Thomas Kallinger and Joris De Ridder and Conny Aerts and Rafael A. Garc{\'{\i}}a and Saskia Hekker and Marc-Antoine Dupret and Benoit Mosser and Patrick Eggenberger and Dennis Stello and Yvonne Elsworth and S{\o}ren Frandsen and Fabien Carrier and Michel Hillen and Michael Gruberbauer and J{\o}rgen Christensen-Dalsgaard and Andrea Miglio and Marica Valentini and Timothy R. Bedding and Hans Kjeldsen and Forrest R. Girouard and Jennifer R. Hall and Khadeejah A. Ibrahim},  title = {{Fast core rotation in red-giant stars as revealed by gravity-dominated mixed modes}},  journal = {Nature},  }