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Matyssek, Rainer; Günthardt-Goerg, Madeleine S.; Saurer, Matthias; Keller, Theodor (1992). Seasonal growth, δ13C in leaves and stem, and phloem structure of birch (Betula pendula) under low ozone concentrations. Trees - Structure and Function, 6(2), pp. 69-76. Springer 10.1007/BF00226583
