On the design of IIR digital filters with equiripple stopband transmission
S. Hazra, Manideep Raya V S R S Reddy · IEEE Transactions on Acoustics Speech and Signal Processing · 1987
Two methods of obtaining low-pass digital filter functions with equiripple loss in the stopband and prescribed poles have been described recently. It is shown that both methods give the same filter functions even though the approaches are different.