Ashraya, A. N., and M. B. Punithkumar. “A Novel Sparse Fourier Orthogonal Coding-Based DOA Estimation Technique Using a Hermitian Propagator and Covariance Projection”. Engineering, Technology & Applied Science Research, vol. 15, no. 5, Oct. 2025, pp. 27749-55, doi:10.48084/etasr.12357.