D. G. Rogers. Irregular, extremal perfect systems of difference sets II. Graphs and Combinatorics, 4(1):285-295, 1988. [doi]
@article{Rogers88-0,
title = {Irregular, extremal perfect systems of difference sets II},
author = {D. G. Rogers},
year = {1988},
doi = {10.1007/BF01864167},
url = {http://dx.doi.org/10.1007/BF01864167},
researchr = {https://researchr.org/publication/Rogers88-0},
cites = {0},
citedby = {0},
journal = {Graphs and Combinatorics},
volume = {4},
number = {1},
pages = {285-295},
}