YQZ

H(z) - [zq.sup.2]H(z[q.sup.2]) = [summation over (j[member of]Z [c.sub.j],[absolute value of j](z) = 1/1 - yqz + 1/1 - [y.sup.-1] [q.sub.z] -1 (21)

H(z) = 1/1 - yqz + 1/1 - [y.sup.-1]qz -1 + z[q.sup.2]H(z[q.sup.2]).

[T.sub.[lambda]](z) = 1/1 - yqz + 1/1 - [y.sup.-1]qz - 1 + z[q.sup.2] [T.sub.[lambda]](z[q.sup.2]).