Gilbert, O., Bocock, K.L. (1960): Changes in leaf litter when placed on the surface of soils with contrasting humus types. II. Changes in the Nitrogen content of oak and ash leaf litter. Journal of Soil Science, 11: 10–19.
Gilg, O. (2004): Old-Growth forests: characteristics, conservation and monitoring. Cahiers Techniques de l’ATEN: 74. ATEN, Montpellier, 96 pp.
Giliam, F.S., Turrill. N.L., Adams, M.B. (1995): Herbaceous-Layer and Overstory Species in Clear-cut and Mature Central Appalachian Hardwood Forests. Ecological Applications, 5: 947-955.
