Kramer, David M.; Johnson, Giles; Kiirats, Olavi; Edwards, Gerald E. (February 2004). «New Fluorescence Parameters for the Determination of QA Redox State and Excitation Energy Fluxes». Photosynthesis Research79 (2): 209. doi:10.1023/B:PRES.0000015391.99477.0d. PMID16228395.
Kramer, David M.; Johnson, Giles; Kiirats, Olavi; Edwards, Gerald E. (February 2004). «New Fluorescence Parameters for the Determination of QA Redox State and Excitation Energy Fluxes». Photosynthesis Research79 (2): 209. doi:10.1023/B:PRES.0000015391.99477.0d. PMID16228395.