[http://query.nytimes.com/gst/fullpage.html?res=9B0DEFDD1139F932A15757C0A961948260]* Keith Davies - Evidence for a Young Sun* Severny, A.B., Kotov, V.A., and Tsap, T.T., 1976.
1* Severny, A.B., Kotov, V.A., and Tsap, T.T., 1976.