Clements, D. J.Anderson, B. D.O.Laub, A. J.Matson, J. B.2025-07-082025-07-080024-3795ORCID:/0000-0002-1493-4774/work/174739559https://hdl.handle.net/1885/733766431* The authors acknowledge funding of the activities of the Cooperative Research Centre for Robust and Adaptive Systems by the Australian Commonwealth Government under the Cooperative Research Centres Programme.28enSpectral factorization with imaginary-axis zeros1997-01-0110.1016/0024-3795(95)00525-00031540153