Douglas R. Stinson, W. D. Wallis. Two-fold triple systems without repeated blocks. Discrete Mathematics, 47:125-128, 1983. [doi]
@article{StinsonW83,
title = {Two-fold triple systems without repeated blocks},
author = {Douglas R. Stinson and W. D. Wallis},
year = {1983},
doi = {10.1016/0012-365X(83)90080-8},
url = {http://dx.doi.org/10.1016/0012-365X(83)90080-8},
researchr = {https://researchr.org/publication/StinsonW83},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics},
volume = {47},
pages = {125-128},
}