1. Ashwokth, E. N., Svec, L. V.: Variation in photosynthesis, chlorophyll content, and ribulose1,5-diphosphate carboxylase activity within tobacco leaves. — Can. J. Plant Sci.54: 409 to 412, 1974.
2. Baldy, Ch. M., Le Buhan, J.-P.: Répartition de la photosynthèse nette dans les feuilles de tabac. — Photosynthetica5: 421–423, 1971.
3. Dickmann, D. I.: Photosynthesis and respiration by developing leaves of cottonwood(Populus delloides BARTR.). — Bot. Gaz.132: 253–259, 1971.
4. Gaastra, P.: Photosynthesis of crop plants as influenced by light, carbon dioxide, temperature, and stomatal diffusion resistance. — Mededel. Landbouwhogesch. Wageningen59: 1–68, 1959.
5. Hardwick, K., Wood, M., Woolhouse, H. W.: Photosynthesis and respiration in relation to leaf age inPerilia frutescens (L.) BRITT. — New Phytol.67: 79–86, 1968.