Eguchi, N., Karatsu, K., Ueda, T., Funada, R., Takagi, K., Hiura, T., Sasa, K. and Koike, T. 2008. Photosynthetic responses of birch and alder saplings grown in a free air CO2 enrichment system in northern Japan. Trees 22: 437-447.

Hoshika, Y., Watanabe, M., Inada, N. and Koike, T. 2012. Growth and leaf gas exchange in three birch species exposed to elevated ozone and CO2 in summer. Water, Air and Soil Pollution 223: 5017-5025.

Kitao, M., Koike, T., Tobita, H. and Maruyama, Y. 2005. Elevated CO2 and limited nitrogen nutrition can restrict excitation energy dissipation in photosystem II of Japanese white birch (Betula platyphylla var. japonica) leaves. Physiologia Plantarum 125: 64-73.

Kitao, M., Lei, T.T., Koike, T., Kayama, M., Tobita, H. and Maruyama, Y. 2007. Interaction of drought and elevated CO2 concentration on photosynthetic down-regulation and susceptibility to photoinhibition in Japanese white birch seedlings grown with limited N availability. Tree Physiology 27: 727-735.

Mao, Z.-J., Wang, Y.-J., Wang, X.-W. and Voronin, P.Y. 2005. Effect of doubled CO2 on morphology: Inhibition of stomata development in growing birch (Betula platyphylla Suk.) leaves. Russian Journal of Plant Physiology 52: 171-175.