POLÍVKA, T., KERFELD, C.A., PASCHER, T., SUNDSTRÖM, V. Spectroscopic properties of the carotenoid 3´-hydroxyechinenone in the orange carotenoid protein from the cyanobacterium Arthrospira maxima. Biochemistry. 2005, 44(-), 3994-4003. ISSN 0006-2960. E-ISSN 1520-4995.