Amarah Batool,  Ijaz Rasool Noorka, Muhammad Afzal  and Ali Hassan Syed 2013. Estimation of Heterosis, Heterobeltiosis and Potence Ratio Over Environments Among Pre and Post Green Revolution Spring wheat in Pakistan. Journal of Basic & Applied Sciences. 9, (Jan. 2013), 36–43. DOI:https://doi.org/10.6000/1927-5129.2013.09.07.