On the modern period the standard works are BerendzenR.HartR.SeeleyD., Man discovers the galaxies (New York, 1976), 164–5; SmithR., The expanding universe: Astronomy's ‘Great Debate’1900–1931 (Cambridge, 1982), 151–2.
2.
LundmarkK., “A preliminary classification of nebulae”, Arkiv for matematik, astronomi och fysik, xixB, no. 8 (1926); HubbleE., “Extragalactic nebulae”, The astrophysical journal, lxiv (1926), 321–69.
3.
Hubble, “Extragalactic nebulae”, 323. Smith, The expanding universe, 152, cites an angry letter from Hubble to Lundmark dated 26 August 1926, and Berendzen, Man discovers the galaxies, 164, a letter from Hubble to Slipher dated 22 June 1926 and similarly critical of Lundmark.
4.
LundmarkK., “Studies of anagalactic nebulae”, Meddelanden från Astronomiska Observatorium Upsala, no. 30 (1927), see p. 24.
5.
LundmarkK., “The motions and the distances of spiral nebulae”, Monthly notices of the Royal Astronomical Society, lxxxv (1925), 865–94, p. 867.
6.
The letter is quoted by Berendzen, Man discovers the galaxies, 165.
7.
Lundmark, “Studies of anagalactic nebulae”, 65–79, where Lundmark uses the data from the 1922 catalogue in a statistical study.
8.
Ibid., 65.
9.
Ibid., 65.
10.
Ibid., 76.
11.
Lundmark, “A preliminary classification of nebulae”, 3.
12.
Ibid., 5.
13.
De VaucouleursG.De VaucouleursA.CorwinH. G.Jr, Second reference catalogue of bright galaxies (Austin, 1979).
14.
LundmarkK., “De Magelhã eska molnens avstånd” (“The distances of the Magellanic Clouds”), Popular astronomisk tidskrift, issue 3 (1924), 146–55, quotation translated from p. 151.
15.
Lundmark, “The motions and distances of spiral nebulae”, 888.
16.
Lundmark, “A preliminary classification of nebulae”, 3.
17.
LundmarkK., “Double spiral nebulae and the law of the variation of the absolute dimensions of anagalactic nebulae”, Arkiv for matematik, astronomi och fysik, xixB, no. 9 (1926), quotation from p. 5.
