1. Proc. 1970 Symp. on Applications of Walsh Functions,1970
2. The Frequency Analysis of Vector-Valued Time Series;Brillinger,1973
3. On the Walsh functions;Fine;Trans. Am. Math. Soc.,1949
4. The generalized Walsh functions;Fine;Trans. Am. Math. Soc.,1950
5. Transmission of Information by Orthogonal Functions;Harmuth,1969