Gauslaa Y, Kopperud C, Solhaug KA. Optimal quantum yield of photosystem II and chlorophyll degradation of Lobaria pulmonaria in relation to pH Lichenologist.  1996  ;28:267-278.

Gauslaa Y. Lobarion, an epiphytic community of ancient forests threatened by acid rain. Lichenologist. 1995  ;27:59-76.