2012.04.02:
論文情報[一次線グループ]「9,400 years of cosmic radiation and solar activity from ice cores and tree rings」

Steinhilber F. et al.,
"9,400 years of cosmic radiation and solar activity from ice cores and tree rings",
PNAS, doi:10.1073/pnas.1118965109, 109, 5967-5971, 2012.