TY - CHAP T1 - Lichen sensitivity to air pollution T2 - Lichen Biology Y1 - 2008 A1 - Gries, C. JF - Lichen Biology PB - Cambridge University Press CY - Cambridge ER - TY - Generic T1 - Lichens as bioindicators of sulfur dioxide Y1 - 2002 A1 - Nash, T.H. A1 - Gries, C. JF - Symbiosis VL - 33(1) ER -