TY - JOUR T1 - Morphological variability of oaks (Quercus robur L., Quercus petraea (Matt.) Liebl., Quercus pubescens Willd.) in northeastern France: preliminary results JF - Annales des Sciences Forestieres Y1 - 1993 A1 - Dupouey, J. A1 - Badeau, V. SP - 35 EP - 40 VL - 50 N1 - doi:10.1051/forest:19930702 ER -