Absorption spectra of Na atoms in dense He Nicole F. Allard, Akira Nakayama, Fernand Spiegelman, John F. Kielkopf and Frank Stienkemeier Eur. Phys. J. D, 67 3 (2013) 52 Published online: 19 March 2013 DOI: 10.1140/epjd/e2013-30523-x