Norris, J R Electron spin resonance of chlorophyll and the origin of signal I in photosynthesis. [electronic resource] - Proceedings of the National Academy of Sciences of the United States of America Mar 1971 - 625-8 p. digital Publication Type: Journal Article ISSN: 0027-8424 Standard No.: 10.1073/pnas.68.3.625 doi Subjects--Topical Terms: Chlorophyll--analysisChlorophyta--metabolismCyanobacteria--metabolism