John P. Boyd. (2013). A Fourier Companion Matrix (Multiplication Matrix) with Real-Valued Elements: Finding the Roots of a Trigonometric Polynomial by Matrix Eigensolving.
            <i>Numerical Mathematics: Theory, Methods and Applications</i>. <i>6</i> (4).
            586-599.
         doi:10.4208/nmtma.2013.1220nm