Johann Georg Hagen (French Wikipedia)

Analysis of information sources in references of the Wikipedia article "Johann Georg Hagen" in French language version.

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archive.org

The Catholic Encyclopedia and its Makers, The Encyclopedia Press, 1917 (lire en ligne), p. 72

Jacoby, Harold, « Review: The photochronograph, and its applications to star transits, by J. G. Hagen and G. A. Fargis », Bull. Amer. Math. Soc., vol. 1, n^o 2,‎ 1891, p. 44–46 (DOI 10.1090/s0002-9904-1891-00025-5)
Ziwet, Alexander, « Review: Index operum Leonardi Euleri, by J. G. Hagen », Bull. Amer. Math. Soc., vol. 3, n^o 7,‎ 1897, p. 256 (DOI 10.1090/s0002-9904-1897-00417-7)

« Father Hagen Dies, Vatican Astronomer », INS, Vatican City,‎ 6 septembre 1930, p. 2 (lire en ligne, consulté le 9 juin 2021)