WHITELEY, Rachel E. - BLACK-SAMUELSSON, Sanna - JANSSON, Gunnar. Within and between population variation in adaptive traits in Ulmus laevis, the European white elm. In Forest genetics : international journal of forest genetics. - Arbora Publishers : Zvolen. ISSN 1335-048X, 2003, vol. 10, no. 4, s. 309-319.