Citation: B. Seith et al., APPEARANCE OF NITRATE REDUCTASE, NITRITE REDUCTASE AND GLUTAMINE-SYNTHETASE IN DIFFERENT ORGANS OF THE SCOTS PINE (PINUS-SYLVESTRIS) SEEDLING AS AFFECTED BY LIGHT, NITRATE AND AMMONIUM, Physiologia Plantarum, 91(3), 1994, pp. 419-426