1. [A-1] Arutunjan, F. G., Talaljan, A. A., “On uniqueness of Haar and Walsh series”, Izv. Akad. Nauk. SSSR Ser. Mat., Vol. 28, 1964, 1391-1408, (in Russian).
2. [A-2] Beauchamp, K. G., A Classified Bilography for Walsh and Related Functions, Cranfield Computing Center, Cranfield, Bedford, England, 1972.
3. [A-3] Bramhall, J. N., An Annotated Bibliography on Walsh and Walsh Related Functions, John Hopkins University, Applied Physics Lab, Silver Spring, Maryland, 1972, 1973, 1974. Reprinted in Schreiber, H., Sandy, G. F., (eds.) Applications of Walsh Functions and Sequency Theory, IEEE Press, 1974, Proc. 1974 Symp. on Applications of Walsh Functions, held at The Catholic University of America, Washington, D. C., 1974.
4. [A-4] Butzer, P. L., Dodson, M. M., Ferreira, P. J. S. G., Higgins, J. R., Schmeisser, G., Stens, R. L., ”Seven pivotal theorems of Fourier analysis, signal analysis, numerical analysis and number theory: their interconnections”, Bull. Math. Sci., Vol. 4, No. 3, 2014, 481 - 525.
5. [A-5] Butzer, P. L., Ferreira, P. J. S. G., Higgins, J. R., Saitoh, S., Schmeisser, G., Stens, R. L., ”Interpolation and sampling: E. T. Whittaker, K. Ogura and their followers”, J. Fourier Anal. Appl., Vol. 17, No. 2, 2011, 320 - 354.