Hayes F, Mills G, Williams P, Harmens H, Buker P. Impacts of summer ozone exposure on the growth and overwintering of UK upland vegetation. Atmospheric Environment. 2006  ;40:4088-4097.

Sutton MA, Milford C, Nemitz E, Theobald MR, D. F, Schjoerring JK, Mattsson ME, Nielsen KH, Husted S, Erisman JW, et al. Biosphere-atmosphere interactions of ammonia with grasslands: experimental strategy and results from a new European initiative. Plant and Soil . 2001  ;228 (1):131-145.

Mulgrew A, Williams P. Biomonitoring of air quality using plants. Berlin, Germany: WHO Collaborating Centre for Air Quality Management and Air Pollution Control; 2000.