Snodgrass, C. Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society;
Kains, N., Bramich, D. M., Arellano Ferro, A., Jaimes, R. F., Jorgensen, U. G., Giridhar, S., et al. (2013). Estimating the parameters of globular cluster M 30 (NGC 7099) from time-series photometry. Astronomy and Astrophysics, 555: A36. doi:10.1051/0004-6361/201321819.