1. Andreeva, T.F., Avdeeva, T.A., Stepanenko, S.: Effect of nitrogen nutrition on glycolate oxidase activity in bean and corn plants. Soviet Plant Physiol. 22, 460?463 (1975)
2. Ashley, D.A., Jackson, W.A., Volk, R.J.: Nitrate uptake and assimilation by wheat seedlings during initial exposure to nitrate. Plant Physiol. 55, 1102?1106 (1975)
3. Avdeeva, T.A., Andreeva, T.F.: Nitrogen nutrition and activities of CO2-fixing enzymes and glyceraldehyde phosphate dehydrogenase in broad bean and maize. Photosynthetica 7, 140?145 (1973)
4. Bange, G.G.J.: Upward transport of potassium in maize seedlings. Plant Soil 22, 280?306 (1965)
5. Ben Zioni, A., Vaadia, Y., Lips, S.H.: Nitrate uptake by roots as regulated by nitrate reduction products of the shoot. Physiol. Plant. 24, 288?290 (1971)