↑ Routh, E.J.; Fuller, A.T. (1975). Stability of motion. Taylor & Francis. Chú thích sử dụng tham số |coauthors= bị phản đối (trợ giúp)
↑ Routh, E.J. (1877). A Treatise on the Stability of a Given State of Motion, Particularly Steady Motion: Particularly Steady Motion. Macmillan and co.
↑ Hurwitz, A. (1964). “On The Conditions Under Which An Equation Has Only Roots With Negative Real Parts”. Selected Papers on Mathematical Trends in Control Theory.
↑ Donald M Wiberg. State space & linear systems. Schaum's outline series. McGraw Hill.
