Gennian Ge, Clement W. H. Lam. Bhaskar Rao designs with block size four. Discrete Mathematics, 268(1-3):293-298, 2003. [doi]
@article{GeL03a,
title = {Bhaskar Rao designs with block size four},
author = {Gennian Ge and Clement W. H. Lam},
year = {2003},
doi = {10.1016/S0012-365X(03)00031-1},
url = {http://dx.doi.org/10.1016/S0012-365X(03)00031-1},
researchr = {https://researchr.org/publication/GeL03a},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics},
volume = {268},
number = {1-3},
pages = {293-298},
}