1. Some types of endolithic lichens;Fry;Ann. Bot. (Lond.),1922
2. Lichens: their biological and economical significance;Perez-Llano;Bot. Rev.,1944
3. Chelation (sequestration) as a biological weathering factor in pedogenesis;Schatz,1954
4. Studies on the pedogenetic action of lichen acids;Ascaso;Pedobiología,1976
5. Traitements des vestiges archeologiques deteriorès par les lichens et les algues;Giacobini,1978