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Sharma, Nisha and Pathania , Vijaylata and Singh , Bikram and Gupta, Raghbir C (2012) Intraspecific variability of main phytochemical compounds in Picrorhiza kurroa Royle ex Benth. from North Indian higher altitude Himalayas using reversed-phase high-performance liquid chromatography. Journal of Medicinal Plants Research, 6 (16). pp. 3181-3187.