1Virmani S S, Young J B, Moon H P, et al. Increasing rice fields through exploitation of heterosis[A]. IRRI Research Paper Series Number 156 [C]. Manila, Philippines: IRRI, 1991.
2Virmani S S, Prasad M N, Kumar I. Breaking yield barrier in rice through exploitation of heterosis [A]. New Frontiers in Rice Re- search [C]. Hyderabad, India: Directorate of Rice Research, 1993.76-85.
