Baddeley JA, Thompson DBA, Lee JA. Regional and historical variation in the nitrogen-content of Racomitrium lanuginosum in Britain In relation to atmospheric nitrogen deposition. Environmental Pollution. 1994  ;84:189-196.

Thompson DBA, Baddeley JA, Woodin (E)SJ, Farmer (E)AM. The effects of acid deposition on nature conservation in Great Britain. Peterborough: Nature Conservancy Council; 1991 pp. 17-28.