JARILLO, J.; DEL OLMO, I.; GÓMEZ-ZAMBRANO, A.; LÁZARO, A.; LÓPEZ-GONZÁLEZ, L.; MIGUEL, E.; NARRO-DIEGO, L.; SÁEZ, D.; PIÑEIRO, M. Photoperiodic control of flowering time: a review. Spanish Journal of Agricultural Research, v. 6, n. S1, p. 221-244, 1 Feb. 2008.