Legge AH, Krupa SV
. Effects of sulphur dioxide.
In: Air Pollution and plant life. 2ndnd ed. Air Pollution and plant life. Chichester: John Wiley & Sons; 2002. pp. 135-162.
. Effects of SO2 on light-modulated enzyme reactions
. In: Gaseous Air Pollutants and Plant Metabolism. Gaseous Air Pollutants and Plant Metabolism. Butterworth-Heinemann Ltd ; 1984.
Bilderback DE, Carlson CE
. Effects of Persistent Volcanic Ash on Douglas-fir in Northern Idaho
. Ogden, Utah: U.S. Dept. of Agriculture, Forest Service, Intermountain Research Station; 1987.