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Saxena, K B and Jayasekera, S J B A and Ariyaratne, H P and Ariyanayagam, R P and Fonseka, H H D (1994) Frequency of natural out-crossing in partially cleistogamous pigeonpea lines in diverse environments. Crop Science, 34 (3). pp. 660-662. ISSN 0011-183X