Gordon C, Wynn JM, Woodin SJ. Impacts of increased nitrogen supply on high Arctic heath: the importance of bryophytes and phosphus availability. New Phytologist . 2001  ;149:461-471.

Woodin SJ, Farmer AM. Impacts of sulphur and nitrogen deposition on sites and species of nature conservation importance in Great Britain. Biological Conservation. 1993  ;63:23-30.