1. Arago, François 1845: ?La prédiction du temps?, in M. J.-A. Barral (ed.) 1858: ?uvres de François Arago, vol. 8, Notices Scientifiques vol. 5, 1?24, Paris.
2. Arrhenius, Svante 1896: On the influence of carbonic acid in the air upon the temperature of the ground, Philos. Mag. (Ser. 5) 41 (251), 237?276.
3. Arrhenius, Svante August 1903: Lehrbuch der kosmischen Physik, Hirzel, Leipzig, 2 vols., 1026 pp. (See vol. 2.)
4. Arrhenius, Svante 1908: Worlds in the Making, trans, by H. Borns, Harper, New York, 230pp. (See chap. 2.)
5. Callendar, G. S. 1938: The artificial production of carbon dioxide and its influence on climate, Q. J. R. Meteor. Soc. 64 (275), 223?240.