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References

1. Procopius; Dewing, Henry Bronson, trans. (1916). Procopius. vol. 2: History of the [Vandalic] Wars, Books III and IV. London, England: William Heinemann. p. 329. ISBN 978-0-674-99054-8. https://books.google.com/books?id=szQjAQAAMAAJ&pg=PA329. 
2. Ochoa, George; Jennifer Hoffman; Tina Tin (2005). Climate: the force that shapes our world and the future of life on earth. Emmaus, PA: Rodale. ISBN 978-1-59486-288-5. , gives this quote as "The Sun gave forth its light without brightness, like the moon during this whole year, and it seemed exceedingly like the Sun in eclipse".
3. Cassiodorus; Hodgkin, Thomas, trans. (1886). The Letters of Cassiodorus. London, England: Henry Frowde. pp. 518–520. https://books.google.com/books?id=aymsvxyyOhoC&pg=PA518.  See: "25. Senator, Praetorian Praefect, to his deputy Ambrosius, an Illustris."
4. Michel le Syrien; Chabot, J.-B., trans. (1901) (in fr). Chronique de Michel le Syrien, Patriarche Jacobite d'Antoche. 2nd vol.. Paris, France: Leroux. pp. 220–221. https://babel.hathitrust.org/cgi/pt?id=uiug.30112069474242&view=1up&seq=228.  From pp. 220–221: "Or, un peu auparavant, en l'an 848, il y eut un signe dans le soleil. … , et le vin avait le goût de celui qui provient de raisins acides." (However, a little earlier, in the year 848 [according to the Greek calendar; 536/537 AD according to the Christian calendar], there was a sign in the sun. One had never seen it [before] and nowhere is it written that such [an event] had happened [previously] in the world. If it were not [true] that we found it recorded in most proven and credible writings, and confirmed by men worthy of belief, we would not have written it [here]; for it's difficult to conceive. So it is said that the sun was darkened, and that its eclipse lasted a year and a half, that is, eighteen months. Every day it shone for about four hours and yet this light was only a feeble shadow. Everyone declared that it would not return to the state of its original light. Fruits didn't ripen, and wine had the taste of what comes from sour grapes.)
5. Gaelic Irish Annals translations http://www.ucc.ie/celt/publishd.html
6. Documents of Ireland http://www.ucc.ie/celt/publishd.html
7. The Annals of the Four Masters http://www.ucc.ie/celt/published/T100005A/index.html
8. The battle is dated 539 in some editions.
9. "Camlan | Robbins Library Digital Projects" (in en). http://d.lib.rochester.edu/camelot/theme/camlan. 
10. Ochoa, George; Jennifer Hoffman; Tina Tin (2005). Climate: the force that shapes our world and the future of life on earth. Emmaus, Pennsylvania: Rodale. p. 71. ISBN 978-1-59486-288-5. 
11. Rosen, William (2007). Justinian's flea: Plague, Empire and the Birth of Europe. London: Jonathan Cape. ISBN 978-0-224-07369-1. 
12. Keys, David Patrick (2000). Catastrophe: an investigation into the origins of the modern world. New York: Ballantine Pub. ISBN 978-0-345-40876-1. https://archive.org/details/catastropheinves00keys. 
13. Stothers, R.B.; Rampino, M.R. (1983). "Volcanic eruptions in the Mediterranean before AD 630 from written and archaeological sources". Journal of Geophysical Research 88 (B8): 6357–6471. doi:10.1029/JB088iB08p06357. Bibcode: 1983JGR....88.6357S.  https://dx.doi.org/10.1029%2FJB088iB08p06357
14. Stothers, R.B. (16 January 1984). "Mystery cloud of AD 536". Nature 307 (5949): 344–345. doi:10.1038/307344a0. Bibcode: 1984Natur.307..344S.  https://dx.doi.org/10.1038%2F307344a0
15. Rampino, M.R.; Self, S.; Stothers, R.B. (1988). "Volcanic winters". Annual Review of Earth and Planetary Sciences 16: 73–99. doi:10.1146/annurev.ea.16.050188.000445. Bibcode: 1988AREPS..16...73R.  https://dx.doi.org/10.1146%2Fannurev.ea.16.050188.000445
16. Arjava, Antti (2005). "The mystery cloud of 536 CE in the Mediterranean sources". Dumbarton Oaks Papers 59: 73–94. doi:10.2307/4128751.  https://dx.doi.org/10.2307%2F4128751
17. Baillie, M.G.L. (1994). "Dendrochronology Raises Questions About the Nature of the AD 536 Dust-Veil Event." The Holocene fig. 3 p. 215.
18. Larsen, L. B.; Vinther, B. M.; Briffa, K. R.; Melvin, T. M.; Clausen, H. B.; Jones, P. D.; Siggaard-Andersen, M.-L.; Hammer, C. U. et al. (2008). "New ice core evidence for a volcanic cause of the A.D. 536 dust veil". Geophys. Res. Lett. 35 (4): L04708. doi:10.1029/2007GL032450. Bibcode: 2008GeoRL..3504708L. http://www.agu.org/pubs/crossref/2008/2007GL032450.shtml. 
19. Wohletz, Ken, Were the Dark Ages Triggered by Volcano-Related Climate Changes in the 6th Century? http://www.ees1.lanl.gov/Wohletz/Krakatau.htm
20. MacIntyre, Ferren (2002). "Simultaneous Settlement of Indo-Pacific Extrema?". Rapa Nui Journal 16 (2): 96–104. 
21. Baillie, M. G. L. (1999). Exodus to Arthur: Catastrophic Encounters with Comets. London: B.T. Batsford. ISBN 978-0-7134-8352-9. 
22. Rigby, Emma; Symonds, Melissa; Ward-Thompson, Derek (February 2004). "A comet impact in AD536?". Astronomy and Geophysics 45 (1): 1.23–1.26. doi:10.1046/j.1468-4004.2003.45123.x. Bibcode: 2004A&G....45a..23R.  https://dx.doi.org/10.1046%2Fj.1468-4004.2003.45123.x
23. Stothers R.B. (26 January 1984). "Mystery cloud of AD 536". Nature 307 (5949): 344–345. doi:10.1038/307344a0. Bibcode: 1984Natur.307..344S.  https://dx.doi.org/10.1038%2F307344a0
24. Abbott, D. H.; Biscaye, P.; Cole-Dai, J.; Breger, D. (December 2008). "Magnetite and Silicate Spherules from the GISP2 Core at the 536 A.D. Horizon". American Geophysical Union, Fall Meeting 2008. 41. pp. 41B–1454. Abstract #PP41B-1454. Bibcode: 2008AGUFMPP41B1454A.  http://adsabs.harvard.edu/abs/2008AGUFMPP41B1454A
25. "Comet smashes triggered ancient famine". New Scientist. 7 January 2009. https://www.newscientist.com/article/mg20126882.900-comet-smashes-triggered-ancient-famine.html. 
26. Dull, R.; J.R. Southon; S. Kutterolf; A. Freundt; D. Wahl; P. Sheets (13–17 December 2010). "Did the TBJ Ilopango eruption cause the AD 536 event?". AGU Fall Meeting Abstracts 13: V13C–2370. Bibcode: 2010AGUFM.V13C2370D.  http://adsabs.harvard.edu/abs/2010AGUFM.V13C2370D
27. Dull, R. A.; Southon, J. R.; Sheets, P. (2001). "Volcanism, ecology and culture: a reassessment of the Volcán Ilopango TBJ eruption in the southern Maya realm". Latin American Antiquity 12 (1): 25–44. doi:10.2307/971755.  https://dx.doi.org/10.2307%2F971755
28. Kutterolf, S.; Freundt, A.; Peréz, W. (February 2008). "Pacific offshore record of plinian arc volcanism in Central America: 2. Tephra volumes and erupted masses". Geochemistry, Geophysics, Geosystems 9 (2). doi:10.1029/2007GC001791. Bibcode: 2008GGG.....902S02K.  https://dx.doi.org/10.1029%2F2007GC001791
29. Dull, Robert A.; Southon, John R.; Kutterolf, Steffen; Anchukaitis, Kevin J.; Freundt, Armin; Wahl, David B.; Sheets, Payson; Amaroli, Paul et al. (October 2019). "Radiocarbon and geologic evidence reveal Ilopango volcano as source of the colossal 'mystery' eruption of 539/40 CE". Quaternary Science Reviews 222: 105855. doi:10.1016/j.quascirev.2019.07.037. http://oceanrep.geomar.de/47558/13/Dull.pdf. 
30. Smith, Victoria C.; Costa, Antonio; Aguirre-Díaz, Gerardo; Pedrazzi, Dario; Scifo, Andrea; Plunkett, Gill; Poret, Mattieu; Tournigand, Pierre-Yves et al. (20 October 2020). "The magnitude and impact of the 431 CE Tierra Blanca Joven eruption of Ilopango, El Salvador". Proceedings of the National Academy of Sciences 117 (42): 26061–26068. doi:10.1073/pnas.2003008117. PMID 32989145.  http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=7584997
31. Sigl, M.; Winstrup, M.; McConnell, J. R.; Welten, K. C.; Plunkett, G.; Ludlow, F.; Büntgen, U.; Caffee, M. et al. (2015). "Timing and climate forcing of volcanic eruptions for the past 2,500 years". Nature 523 (7562): 543–549. doi:10.1038/nature14565. PMID 26153860. Bibcode: 2015Natur.523..543S. https://pure.qub.ac.uk/portal/en/publications/timing-and-climate-forcing-of-volcanic-eruptions-for-the-past-2500-years(04c84f13-a3c3-48e4-81ca-1507cdd4359d).html. . Archived copy
32. Gibbons, Ann (15 November 2018). "Why 536 was 'the worst year to be alive'". Science. doi:10.1126/science.aaw0632.  https://dx.doi.org/10.1126%2Fscience.aaw0632
33. Morten Axboe (2001). "Året 536". Skalk (4): 28–32. 
34. Morten Axboe (1999). "The year 536 and the Scandinavian gold hoards". Medieval Archaeology 43: 186–188. http://ads.ahds.ac.uk/catalogue/adsdata/arch-769-1/ahds/dissemination/pdf/vol43/43_186_188.pdf. 
35. Ström, Folke: Nordisk Hedendom, Studentlitteratur, Lund 2005, ISBN:91-44-00551-2 (first published 1961) among others, refer to the climate change theory.
36. Gunn, Joel D. (2000). The Years Without Summer: Tracing A.D. 536 and its Aftermath. British Archaeological Reports (BAR) International. Oxford, England: Archaeopress. ISBN 978-1-84171-074-7. 
37. Dark, Ken (November 1999). "Jumbling old events with modern myths". British Archaeology (49). http://www.britarch.ac.uk/ba/ba49/ba49book.html. Retrieved 2020-07-14. 
38. Breeze, Andrew (2020). British Battles 493-937: Mount Badon to Brunanburh. London: Anthem Press. pp. 13–24. ISBN 9781785272233.