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2. Kernar Von Marilaun (translated by F. W. Oliver, The Natural History of Plants, Blackie, 1894.
3. Huxley, A., Plant and Planet, Penguin Books, 1974, p. 105.
4. Huxley, A., Plant and Planet, Penguin Books, 1974, p. 199.
5. Manning, M., `Corrosion of building materials due to atmospheric pollution in the United Kingdom’, in Air Pollution, Acid Rain and the Environment (ed. K. Mellanby), Watt Committee Report No. 18, Elsevier, London, 1988, pp. 37–66.