<Ul> <Li> "Pierre Jules Cesar Janssen". Monthly Notices of the Royal Astronomical Society . 68 (4): 245 . 1908 . Bibcode: 1908MNRAS...68...245...doi: 10.1093 / mnras / 68.4. 245 . </Li> <Li> Obituary, from Popular Astronomy, 1908, vol. 16, pp. 72--74 </Li> <Li> Obituary, from Astronomische Nachrichten, 1908, vol. 177, p. 63 (in French) </Li> <Li> Obituary, from The Astrophysical Journal, 1908, vol. 28, pp. 89--99 (in French) </Li> <Li> 1911 Encyclopædia Britannica Eleventh Edition, entry for Janssen </Li> <Li> Janssen statue, description and black - and - white picture from The Observatory, 1922, vol. 45, pp. 175--176 </Li> <Li> Brief biography, from the High Altitude Observatory at Boulder, Colorado </Li> <Li> Pierre Janssen at Who's Who of Victorian Cinema </Li> <Li> This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Janssen, Pierre Jules César". Encyclopædia Britannica. 15 (11th ed .). Cambridge University Press . p. 155 . </Li> <Li> Launay, Françoise (2012). The Astronomer Jules Janssen: A Globetrotter of Celestial Physics . Springer . </Li> <Li> Launay, Françoise (2008). Un Globe - Trotter de la Physique Céleste: L'astronome Jules Janssen . Vuibert . </Li> <Li> Nath, B.B. (2012). The Discovery of Helium and the Birth of Astrophysics . Springer . </Li> </Ul> <Li> "Pierre Jules Cesar Janssen". Monthly Notices of the Royal Astronomical Society . 68 (4): 245 . 1908 . Bibcode: 1908MNRAS...68...245...doi: 10.1093 / mnras / 68.4. 245 . </Li> <Li> Obituary, from Popular Astronomy, 1908, vol. 16, pp. 72--74 </Li> <Li> Obituary, from Astronomische Nachrichten, 1908, vol. 177, p. 63 (in French) </Li>

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