Mingzhi Zhu, Gennian Ge. Mixed group divisible designs with three groups and block size 4. Discrete Mathematics, 310(17-18):2323-2326, 2010. [doi]
@article{ZhuG10,
title = {Mixed group divisible designs with three groups and block size 4},
author = {Mingzhi Zhu and Gennian Ge},
year = {2010},
doi = {10.1016/j.disc.2010.05.014},
url = {http://dx.doi.org/10.1016/j.disc.2010.05.014},
researchr = {https://researchr.org/publication/ZhuG10},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics},
volume = {310},
number = {17-18},
pages = {2323-2326},
}