Rajput, J, Rahbek, D B, Andersen, L H, Hirshfeld, A, Sheves, M, Altoè, P, Orlandi, G & Garavelli, M 2010, ' Probing and Modeling the Absorption of Retinal Protein Chromophores in Vacuo ', Angewandte Chemie International Edition, vol. 49, no. 10, pp. 1790-1793 . https://doi.org/10.1002/anie.200905061