Rapid seedling obtaining from European ash species Fraxinus excelsior (L.) and Fraxinus angustifolia (Vahl.) Christian Raquininsta, Bernard Jung-Muller, Jean Dufour and Nathalie Frascaria-Lacoste Ann. For. Sci., 59 2 (2002) 219-224 DOI: 10.1051/forest:2002009