Singh, J., Rajasekaran, A., Raina, R., & Rana, R. (2011). Evaluation of Different Collections of <I>Hypericum perforatum</I> L. in Himachal Pradesh for Biomass Yield and Hypericin Content. Indian Forester, 137(7), 868–871. https://doi.org/10.36808/if/2011/v137i7/12872