Refinements of the Half-Bit and Factor-of-Two Bounds for Capacity in Gaussian Channel with Feedback. - Han Wu Chen; Kenjiro Yanagi (IEEE Trans. Inf. Theory, 1999)

Upper bounds on the capacity of discrete-time blockwise white Gaussian channels with feedback. - Han Wu Chen; Kenjiro Yanagi (IEEE Trans. Inf. Theory, 2000)

The convex-concave characteristics of Gaussian channel capacity functions. - Han Wu Chen; Kenjiro Yanagi (IEEE Trans. Inf. Theory, 2006)