OESTERHELT, D. Rhodopsin-like protein from the purple membrane of Halobacterium halobium. Nat New Biol. 1971, 233, 39, 149-152
HILDEBRAND, E. Two photosystems controlling behavioural responses of Halobacterium halobium. Nature. 1975, 257, 5521, 46-48
BOGOMOLNI, R. A. Identification of a third rhodopsin-like pigment in phototactic Halobacterium halobium. Proc Natl Acad Sci U S A. 1982, 79, 20, 6250-6254