Intermolecular energy transfer between aequorin and GFP in jellyfish and when co-absorbed on Sephadex column.

References:

JG Morin, JW Hastings: Energy Transfer in a bioluminescent system. J. Cell Physiol. 77 (1971) 313-18.

H Morise, O Shimomura, FH Johnson, J Winant: Intermolecular Energy Transfer in Bioluminescent systems of aequorea. Biochemistry 13 (1974) 2656-62.