Henry D. Shapiro. Generalized Latin squares on the torus. Discrete Mathematics, 24(1):63-77, 1978. [doi]
@article{Shapiro78-1,
title = {Generalized Latin squares on the torus},
author = {Henry D. Shapiro},
year = {1978},
doi = {10.1016/0012-365X(78)90173-5},
url = {http://dx.doi.org/10.1016/0012-365X(78)90173-5},
researchr = {https://researchr.org/publication/Shapiro78-1},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics},
volume = {24},
number = {1},
pages = {63-77},
}