doi : 10.1126/science.289.5477.270 . PMID 10894770 . http://www.sciencemag.org/cgi/content/abstract/289/5477/270 .   ^ Robock, Alan (1979-12-21). "The "Little Ice Age": Northern Hemisphere Average Observations and Model Calculations". Science 206 (4425): 1402–1404. doi : 10.1126/science.206.4425.1402 . PMID 17739301 .   ^ A Chilling Possibility ^ Ravilious, Kate (2006-02-27). " Europe's chill linked to disease