S. REZADUST, M. M. KARIMI, S. VAZAN, M. R. ARDAKANI, A. KASHANI, and E. GHOLINEZHAD, “The Modeling of Development Stages of Sunflower on the Basis of Temperature and Photoperiod”, Not Bot Horti Agrobo, vol. 38, no. 1, pp. 66–70, Jun. 2010.