Hansen, B. Climatic Changes on a Yearly to Millennial Basis: Geological, Historical and Instrumental Records: Proceedings of the Second Nordic Symposium on Climatic Changes and Related Problems, Held in Stockholm, Sweden, May 16-20, 1983. Ed. By N.-A. Morner and W. Karlen. Reidel, Dordrecht 1984. gt 1987, 87.