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Negi, Hans Raj and Gadgil, Madhav (2002) Cross-taxon surrogacy of biodiversity in the Indian Garhwal Himalaya. In: Biological Conservation, 105 (2). pp. 143-155.
Negi, Hans Raj and Gadgil, Madhav (1996) Patterns of distribution of macrolichens in western parts of Nanda Devi Biosphere Reserve. In: Current Science (Bangalore), 71 (7). pp. 568-575.