Christopher Landauer. On Uniform Covers and t-Designs. Journal of Combinatorial Theory, Series A, 19(2):223-227, 1975.
@article{Landauer75, title = {On Uniform Covers and t-Designs}, author = {Christopher Landauer}, year = {1975}, researchr = {https://researchr.org/publication/Landauer75}, cites = {0}, citedby = {0}, journal = {Journal of Combinatorial Theory, Series A}, volume = {19}, number = {2}, pages = {223-227}, }