Krause, Martin Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;
Charbonnel, C., Chantereau, W., Krause, M., Primas, F., & Wang, Y. (2014). Are there any first-generation stars in globular clusters today? Astronomy & Astrophysics, 569: L6. doi:10.1051/0004-6361/201424804.