1. Suslov, V. M. 1968. Economical significance of sunflowers in the U.S.S.R. Proc. 3rd Int. Sunflower Conf. August13–151968, Crookston, Minnesota. pp.1
2. Panchenko, A. Y. 1966. Sunflower production and breeding in the USSR. Proc. 2nd Int. Sunflower Conf. August1966, Morden, Manitoba. pp.16
3. Extension Bulletin 299;Robinson R. G.,1973