1. Andrews, H.C. (1970). Computer Techniques in Image Processing. Academic Press, New York.
2. Andrews, H.C. and Caspari, K.L. (1970a). A generalized technique for spectral analysis. IEEE Trans. Comput., C19, 16–25.
3. Andrews, H.C. and Caspari, K.L. (1970b). Orthogonal transformations. In Andrews ( 1970, pp. 73–103 ).
4. Andrews, H.C. and Kane, J. (1970). Kronecker matrices, computer implementation, and generalized spectra. J. Assoc. Comput. Mach., 17, 260–268.
5. Bracewell, R.N. (1986). The Fourier Transform and Its Applications, 2nd edn. revised. McGraw-Hill, New York.