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Asian Journal of Plant Sciences 4 ( 4 ): 383 - 387 , 2005
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Journal of Biological Sciences 1 ( 7 ): 554 - 559 , 2001
Muhammad Jamal Khan, Riaz A. Khattak and N. Daula
Pakistan Journal of Biological Sciences 2 ( 3 ): 642 - 644 , 1999