"Distant future of the Sun and Earth revisited" | "Group 29: Multi-axes symmetric, both soft and straight-lined, closed signs with crossing lines" |
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Explanatory Supplement to the Astronomical Almanac |
Late Proterozoic low-latitude global glaciation: the Snowball Earth | Mill Valley, CA: University Science Books |
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UK Department for Environment, Food and Rural Affairs | Potsdam Institute for Climate Impact Research |
Rome, Italy: Food and Agriculture Organization of the United Nations | Online Astronomy eText Table of Contents |
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World Book Online Reference Center | Rogers, John James William 2004 |