1. Digital Filters and their Applications;Cappellini,1978
2. Approximating transfer function by linear programming;Matthews,1963
3. Two new algorithms for rational approximation;Cheney;Numer. Math.,1961
4. Best rational approximation of functions;Henry;J. Approximation Theory,1973
5. The Differential Correction Algorithm for rational 1∞ approximation;Barrodale;SIAM J. Numerical Analysis,1972