It is shown that the reachability and the observability indices of appropriately defined pairs of matrices provide the key for solving the minimal rational (bitangen- tial) interpolation problem. © 1990.
Antoulas, A. C., Ball, J. A., Kang, J., & Willems, J. C. (1990). On the solution of the minimal rational interpolation problem. Linear Algebra and Its Applications, 137–138(C), 511–573. https://doi.org/10.1016/0024-3795(90)90141-X