Multi-radionuclide evidence for the solar origin of the cosmic-ray events of AD 774/5 and AD 993/4

Mekhaldi, F., Muscheler, R., Adolphi, F., Multi-radionuclide evidence for the solar origin of the cosmic-ray events of AD 774/5 and AD 993/4, Nature Communications, 10.1038/ncomms9611