Sessile oak (Quercus petraea Liebl.) site index variations in relation to climate, topography and soil in even-aged high-forest stands in northern France Laurent Bergès, Richard Chevalier, Yann Dumas, Alain Franc and Jean-Michel GilbertAnn. For. Sci., 62 5 (2005) 391-402DOI: https://doi.org/10.1051/forest:2005035