B. K. Sharma, V. P. S. Verma, and P. P. Jain, “Introduction of an Exotic Strain of <I>Valeriana officinalis</I> Linn. (from U.S.S.R.) for its Cultivation and Exploitation in Chakrata Hills, Distt. Dehra Dun, India”, Indian Forester, vol. 105, no. 3, pp. 211–216, Mar. 1979.