Andries E. Brouwer, Alexander Schrijver, Haim Hanani. Group divisible designs with block-size four. Discrete Mathematics, 306(10-11):939-947, 2006. [doi]
@article{BrouwerSH06,
title = {Group divisible designs with block-size four},
author = {Andries E. Brouwer and Alexander Schrijver and Haim Hanani},
year = {2006},
doi = {10.1016/j.disc.2006.03.015},
url = {http://dx.doi.org/10.1016/j.disc.2006.03.015},
tags = {e-science},
researchr = {https://researchr.org/publication/BrouwerSH06},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics},
volume = {306},
number = {10-11},
pages = {939-947},
}