(en) Francois Buscot, Ajit Varma, Microorganisms in Soils. Roles in Genesis and Functions, Springer Science & Business Media, (lire en ligne), p. 34.
(en) Peter A. Thomas, Trees. Their Natural History, Cambridge University Press, (lire en ligne), p. 13.
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(en) Ullmar Nordén, « Leaf litterfall concentrations and fluxes of elements in deciduous tree species », Scandinavian Journal of Forest Research, vol. 9, nos 1-4, , p. 9-16 (DOI10.1080/02827589409382807).