Masashi Naito Shun Watanabe Ryutaroh Matsumoto Tomohiko Uyematsu Secret Key Agreement by Soft-decision of Signals in Gaussian Maurer's Model http://arxiv.org/abs/0804.2940 2008 CoRR abs/0804.2940 db/journals/corr/corr0804.html#abs-0804-2940 informal publication