Jakob Karl Ernst Halm (1866 – 1944)[1][2] was a pioneer of stellar dynamics and the first person to suggest the existence of a mass–luminosity relation for stars.
- ^ Glass, I.S. (2014). "Jacob Karl Ernst Halm (1865-1944)". Monthly Notes of the Astronomical Society of South Africa. 73 (2): 14–23. Bibcode:2014MNSSA..73...14G.
- ^ Poggendorff, J.C. (1863) [1863 and later]. Biographisch-Literarisches Handwörterbuch. Barth.