Cline, J., Liu, Z.W., Moore, G.D., Farzan, Y. and Xue, W. (2014) 3.5 keV X-Rays as the “21 cm Line” of Dark Atoms, and a Link to Light Sterile Neutrinos. Physical Review D, 89, Article ID: 121302.
http://arxiv.org/abs/1404.3729
http://dx.doi.org/10.1103/physrevd.89.121302

has been cited by the following article:

• TITLE: Lα Line of Dark Positronium as a Nongravitational Detection of DM

  AUTHORS: V. Burdyuzha, V. Charugin

  KEYWORDS: Atomic Dark Matter, Positronium, Compton Scattering

  JOURNAL NAME: Journal of Modern Physics, Vol.6 No.13, October 26, 2015

  ABSTRACT: An attempt to predict the new atomic dark matter lines is done on the example of a dark lepton atom-positronium. Its Layman-alpha line with the energy near 3 GeV may be observable if the appropriate conditions are realized. For this we have studied a γ-ray excess in the center of our galaxy. In principle, this excess may be produced by the Lα line of a dark positronium in the medium with Compton scattering. The possibility of observations of an annihilation line (E~300 TeV) of dark positronium is also predicted. Other proposals to observe the atomic dark matter are shortly described. Besides, Hα line (1.3μ) of usual positronum must be observable in the direction on the center of our galaxy.