E. Akhmedov, V. Rubakov, und A. Smirnov. (1998)cite arxiv:hep-ph/9803255Comment: RevTex, 5 pages. Following the referee's suggestion the lepton asymmetry re-derived in the density matrix formalism. Results unchanged. Version to be published in Phys. Rev. Lett.
D. Baumann, und H. Peiris. (2008)cite arxiv:0810.3022
Comment: 18 pages, 12 figures. Invited review to appear in Advanced Science
Letters Special Issue on Quantum Gravity, Cosmology and Black Holes.