[25]Usoskin, I. G., B. Kromer, F. Ludlow, J. Beer, M. Friedrich, G. A. Kovaltsov, S. K. Solanki and L. Wacker (2013). 'The AD775 cosmic event revisited: the Sun is to blame.' Astronomy & Astrophysics 552(L3): 1-4.
[55]Bard, E, Hamelin, B, Fairbanks, RG, Zindler, A. 1990. Calibration of the 14C timescale over the past 30,000 years using mass spectrometric U-Th ages from Barbados corals. Nature 345: 405-410.
[56]Bard, E, Arnold, M, Hamelin, B, Tisnerat-Laborde, N, Cabioch, G, 1998. Radiocarbon calibration by means of mass spectrometric Th- 230/U-234 and C-14 ages of corals: An updated database including samples from Barbados, Mururoa and Tahiti. Radiocarbon 40, 1085-1092.