4John M. Native plants as bioindicators of air pollutants: contributed papers to a symposium held in conjunction with the 34th air pollution workshop [ J]. Environmental Pollution,2003, 125(1): 1-2.
5Szczepaniak K M B. Aspects of the biomonitoring studies using mosses and lichens as indicators of metal pollution[J].Environmental Research, 2003, 93(3):221-230.
6Leonard H W. Native plant species suitable as bioindicators and biomonitors for airborne fluoride[J]. Environmental Pollution, 2003, 125(1):3-11.