1. Chaudhary R C, Virmani S S and Khush G S 1981. Pattern of pollen abortion in some cytoplasmic genetic male sterile lines of rice. Oryza, 88(3): 140-142.
2. Gill H S and Sheoran R K 2002. Heterotic studies in sunflower over environments. National Journal of Plant Improvement, 4(1): 53-56.
3. Giriraj K, Hiremath S R and Seenappa K 1987. Combining ability of converted male sterile lines of sunflower (Helianthus annuus L.). Indian Journal of Genetics and Plant Breeding, 47: 315-316.
4. Goksoy A T, Turkec A and Mturan Z 2000. Heterosis and combining ability in sunflower.Indian Journal ofAgricultural Sciences, 70(8): 525-529.
5. Kadkol G P, Anand I J and Sharma R P 1984. Combining ability and heterosis in sunflower. Indian Journal of Genetics and Plant Breeding, 44: 447-451.