forĂȘt de Lyman alpha

[1998] The Lyman alpha forest in the spectra of quasistellar objects ; Michael Rauch ; Annual Review of Astronomy and Astrophysics 36 (1998) p. 267 [lien]
[2005] [Search and Discovery] X-Ray Absorption Lines Probe the Missing Half of the Cosmic Baryon Population ; Bertram Schwarzschild ; Physics Today 58 (mar 2005) p. 19 [lien]