%0 Journal Article %T Low-cost chamber design for simultaneous CO2 and O2 flux measurements between tree stems and the atmosphere %A Helm, Juliane %A Hartmann, Henrik %A Göbel, Martin %A Hilman, Boaz %A Herrera Ramírez, David %A Muhr, Jan %J Tree Physiology %V 41 %N 9 %P 1767-1780 %@ 0829-318X %D 2021-09-10 %I Oxford University Press %~ DeepDyve