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Referencias:

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• Ferry, B.W., Baddeley, M.S., Hawksworth, D.L., (1973) Air Pollution and Lichens, , London: Athlone Press
• Ferry, B.W., Coppins, B.J., Lichen transplant experiments and air pollution studies (1979) Lichenologist, 11, pp. 63-73
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• Garty, J., Fuchs, C., Zisapel, N., Galun, M., Heavy metals in the lichen Caloplaca aurantia from urban, suburban and rural regions in Israel (A comparative study) (1977) Water, Air and Soil Pollution., 8, pp. 171-188
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• Puckett, K.J., Tomassini, F.D., Nieboer, E., Richardson, D.H.S., Potassium efflux by lichen thalli folowing exposure to aqueous sulphur dioxide (1977) New Phytologist, 79, pp. 135-145
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