URBAN, Otmar - MAREK, Michal V. - JANOUŠ, Michal. Long-term influence of elevated atmospheric CO2 concentrations is responsible for down-regulation of Norway spruce photosynthesis. In Ekológia : časopis pre ekologické problémy biosféry. - Slovak Academic Press : Bratislava. ISSN 1335-342X, vol. 19, Supplement 1/2000, s. 24-34.