A. Saibaba. (2015)cite arxiv:1511.05208v2.pdfComment: 28 pages, 9 figures, minor revisions. Lemma 3.2 has been removed and result of Theorem 3.3 (new version) is significantly better.
Y. Yang, and M. Pesavento. (2015)cite arxiv:1506.04972v2.pdfComment: submitted to IEEE Transactions on Signal Processing; original title: A Novel Iterative Convex Approximation Method.