Remarks on "The mechanics of bilinear transformation"
E.I. Jury · IEEE Transactions on Audio and Electroacoustics · 1973
The entries in X matrix of Power [1]-[3] and in Q matrix of Fielder [4] are further simplified. In fact, for n even one needs to calculate n/2 × n/2 elements, and for n odd, (n - 1)/2 × (n - 1)/2 elements of these matrices. This simplification is based on certain properties of the rows and columns of the Q and X matrices.