Kriek, M., van Dokkum, P. G., Franx, M., Förster Schreiber, N. M., Gawiser, E., Illingworth, G. D., et al. (2006). Direct measurements of the stellar continua and balmer/4000 Å breaks of red z > 2 galaxies: redshifts and improved constraints on stellar populations. The Astrophysical Journal, 645(1 Part 1), 44-54. doi:10.1086/504103.