Macfall, J S Observation of the Oxygen Diffusion Barrier in Soybean (Glycine max) Nodules with Magnetic Resonance Microscopy. [electronic resource] - Plant physiology Dec 1992 - 1691-7 p. digital Publication Type: Journal Article ISSN: 0032-0889 Standard No.: 10.1104/pp.100.4.1691 doi