Elizabeth J. Billington, Ebadollah S. Mahmoodian. Multi-Set designs and numbers of common triples. Graphs and Combinatorics, 9(2-4):105-115, 1993. [doi]
@article{BillingtonM93,
title = {Multi-Set designs and numbers of common triples},
author = {Elizabeth J. Billington and Ebadollah S. Mahmoodian},
year = {1993},
doi = {10.1007/BF02988298},
url = {http://dx.doi.org/10.1007/BF02988298},
researchr = {https://researchr.org/publication/BillingtonM93},
cites = {0},
citedby = {0},
journal = {Graphs and Combinatorics},
volume = {9},
number = {2-4},
pages = {105-115},
}