Dawson, K. S., Kneib, J.-P., Percival, W. J., Alam, S., Albareti, F. D., Anderson, S. F., et al. (2016). The SDSS-IV extended Baryon oscillation spectroscopy survey: overview and early data. The Astronomical Journal, 151(2): 44, pp. 1-34. doi:10.3847/0004-6256/151/2/44.