Meena, H. P., Sujatha, M., & Varaprasad, K. S. (2013). Achievements and bottlenecks of heterosis breeding of sunflower (Helianthus annuus L.) in India. INDIAN JOURNAL OF GENETICS AND PLANT BREEDING, 73(02), 123–130. https://doi.org/10.5958/j.0975-6906.73.2.019