Hiroshi Kimura, Hiroyuki Ohmori. Construction of hadamard matrices of order 28. Graphs and Combinatorics, 2(1):247-257, 1986. [doi]
@article{KimuraO86,
title = {Construction of hadamard matrices of order 28},
author = {Hiroshi Kimura and Hiroyuki Ohmori},
year = {1986},
doi = {10.1007/BF01788099},
url = {http://dx.doi.org/10.1007/BF01788099},
researchr = {https://researchr.org/publication/KimuraO86},
cites = {0},
citedby = {0},
journal = {Graphs and Combinatorics},
volume = {2},
number = {1},
pages = {247-257},
}