1. http://adsabs.harvard.edu/full/1925JRASC..19..265M
2. http://www.todayinsci.com/F/Flammarion_Camille/FlammarionCamille-Bio.htm
3. http://www.astrobio.net/amee/spring_2007/retrospections.htm
4. http://www.encyclopedia.com/topic/Nicolas_Camille_Flammarion.aspx
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