. Toxicological profile for cobalt
. Atlanta, GA: gency for Toxic Substances and Disease Registry; 1992.
. Air pollution and agriculture
. Outlook on Agriculture . 1991 ;20:139-144.
Ashmore MR, Wilson [E]RB
. Critical levels of air pollutants for Europe
. London: Air Quality Division, Department of the Environment; 1994.
. Decline of ectomycorrhizal fungi in Europe.
. Agriculture Ecosystems and Environment. 1991 ;35:209-244.