W. Kinney, und K. Tzirakis. (2007)cite arxiv:0712.2043
Comment: 10 pages, LaTeX; V2: version submitted to PRD. References added,
minor error in text corrected.
M. Alishahiha, E. Silverstein, und D. Tong. (2004)cite arxiv:hep-th/0404084
Comment: 30 pages latex. v2: references added. v3: correction in three point
function. v4: sign of non-Gaussianity corrected; fNL is negative.
E. Silverstein, und D. Tong. (2003)cite arxiv:hep-th/0310221
Comment: 39 pages. v2: References added. v3: comments on conformal and
curvature couplings revised.