Bard, E.; Stuiver, M.; Shackleton, N. J. (1993): How accurate are our chronologies of the past?. John Wiley & Sons, Chichester, United Kingdom, In: Eddy, J. A. (editor), Oeschger, H. (editor), Global changes in the perspective of the past, 12, 103-120, georefid:2004-038034