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皮埃爾·朱爾·塞薩爾·讓森（法語：Pierre Jules César Janssen，1824年2月22日—1907年12月23日）是一位法國天文學家，他和英國科學家約瑟夫·諾曼·洛克耶一起被認為是發現太陽色球層的氣態性質，並且發現氦這種元素。
- Pierre Jules Cesar Janssen. Monthly Notices of the Royal Astronomical Society. 1908, 68 (4): 245–249. Bibcode:1908MNRAS..68..245.. doi:10.1093/mnras/68.4.245.
- Obituary, from Popular Astronomy, 1908, vol. 16, pp. 72–74
- Obituary, from Astronomische Nachrichten, 1908, vol. 177, p. 63 (in French)
- Obituary, from The Astrophysical Journal, 1908, vol. 28, pp. 89–99 (in French)
- Janssen statue （页面存档备份，存于互联网档案馆）, description and black-and-white picture from The Observatory, 1922, vol. 45, pp. 175–176
- Brief biography, from the High Altitude Observatory at Boulder, Colorado
- Launay, Françoise. The Astronomer Jules Janssen: A Globetrotter of Celestial Physics. Springer. 2012.
- Launay, Françoise. Un Globe-Trotter de la Physique Céleste: L'astronome Jules Janssen. Vuibert. 2008.
- Nath, B. B. The Discovery of Helium and the Birth of Astrophysics. Springer. 2012.
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