Pitcairn CER, Leith ID, Sheppard LJ, Sutton MA, Fowler D, Munro RC, Tang S, Wilson D. The relationship between nitrogen deposition, species composition and foliar nitrogen concentrations in woodland flora in the vicinity of livestock farms. Environmental Pollution . 1998  ;102:41-48.

Carreira JA, Harrison AF, Sheppard LJ, Woods C. Reduced soil P availability in a Sitka spruce (Picea sitchensis (Bong) Carr) plantation induced by applied acid-mist: Significance in forest decline. Forest Ecology and Management . 1997  ;92:53-166.