Silva Aguirre, Victor Stellar Astrophysics, MPI for Astrophysics, Max Planck Society;
Bedding, T. R., Mosser, B., Huber, D., Montalbán, J., Beck, P., Christensen-Dalsgaard, J., et al. (2011). Gravity modes as a way to distinguish between hydrogen- and helium-burning red giant stars. Nature, 471(7340), 608-611. doi:10.1038/nature09935.