Discrete Transforms, Semidefinite Programming, and Sum-of-Squares Representations of Nonnegative Polynomials. - Tae Roh; Lieven Vandenberghe (SIAM J. Optim., 2006)

Interior-Point Algorithms for Sum-Of-Squares Optimization of Multidimensional Trigonometric Polynomials. - Tae Roh; Bogdan Dumitrescu; Lieven Vandenberghe (ICASSP (3), 2007)

Multidimensional FIR Filter Design Via Trigonometric Sum-of-Squares Optimization. - Tae Roh; Bogdan Dumitrescu; Lieven Vandenberghe (J. Sel. Topics Signal Processing, 2007)