VAN DEN DRIESSCHE, R. Phosphorus, copper and zinc supply levels influence growth and nutrition of a young Populus trichocarpa (Torr.& Gray) x P. deltoides (Bartr. ex Marsh) hybrid. In New forests. - Kluwer Academic Publishers : Dordrecht. ISSN 0169-4286, 2000, vol. 19, no. 2, s. 143-157.