Sheppard LJ, Crossley A, Harvey F, Parrington J, White CC. Early effects of acid mist on Sitka spruce planted on acid peat. Phyton (Horn Austria). 1998  ;39:1-25.

White CC, Dawod AM, Cruickshank K, Gammack S, Cresser MS. Evidence for acidification of sensitive Scottish soils by atmospheric deposition. Water, Air and Soil Pollution. 1995  ;85:1203-1208.