Leaf morphology as species indicator in seedlings of Quercus robur L. and Q. petraea (Matt.) Liebl.: modulation by irradiance and growth flush Stéphane Ponton, Jean-Luc Dupouey and Erwin DreyerAnn. For. Sci., 61 1 (2004) 73-80DOI: https://doi.org/10.1051/forest:2003086