Bounds on the size of nonnegative definite circulant embeddings of positive definite Toeplitz matrices. - Garry N. Newsam; C. R. Dietrich (IEEE Trans. Inf. Theory, 1994)

Fast and Exact Simulation of Stationary Gaussian Processes through Circulant Embedding of the Covariance Matrix. - C. R. Dietrich; Garry N. Newsam (SIAM J. Sci. Comput., 1997)