For example: Proust, J.-L. (1799). Researches on copper, Ann. chim., 32:26-54. Excerpt, in Henry M. Leicester and Herbert S. Klickstein, A Source Book in Chemistry, 1400-1900, Cambridge, MA: Harvard, 1952. Accessed 2008-05-08.
Proust argued that compound applies only to materials with fixed proportions: Proust, J.-L. (1806). Sur les mines de cobalt, nickel et autres, Journal de Physique, 63:566-8. Excerpt, from Maurice Crosland, ed., The Science of Matter: a Historical Survey, Harmondsworth, UK: Penguin, 1971. Accessed 2008-05-08.
Dalton, J. (1808). A New System of Chemical Philosophy, volume 1, Manchester. Excerpt. Accessed 2008-05-08.
