Zainal  zadeh, Hossein, Seddhgi  Niya, Masoumeh, Ghaffari, Mahdi, Roshdi, Mohsen. “Study of yield, yield components and some agronomic traits of sunflower cultivars in summersecond  cropping.” Agroecology Journal, vol. 1, no. 1, 2005, pp. 54-66.