Sharma, B. K.; Verma, V. P. S.; Jain, P. P. 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 1979, 105, 211-216.