Cottrell, P. L. Stellar Astrophysics, MPI for Astrophysics, Max Planck Society;
Worley, C. C., & Cottrell, P. L. (2012). Medium-resolution s-process element survey of 47 Tuc giant stars. Publications of the Astronomical Society of Australia, 29(1), 29-41. doi:10.1071/AS11048.