Keith W. Henderson. Some Notes on the Walsh Functions. IEEE Transactions on Computers, 13(1):50-52, 1964. [doi]
@article{Henderson64,
title = {Some Notes on the Walsh Functions},
author = {Keith W. Henderson},
year = {1964},
doi = {10.1109/PGEC.1964.263835},
url = {http://dx.doi.org/10.1109/PGEC.1964.263835},
researchr = {https://researchr.org/publication/Henderson64},
cites = {0},
citedby = {0},
journal = {IEEE Transactions on Computers},
volume = {13},
number = {1},
pages = {50-52},
}