forêt 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 [doi]
2005 / [Search and Discovery] X-Ray Absorption Lines Probe the Missing Half of the Cosmic Baryon Population / Bertram Schwarzschild / Physics Today 58 (2005) p. 19 [doi]