Geodesic
A Note on (r, λ)-Systems
Canadian mathematical bulletin, Tome 20 (1977) no. 4, pp. 511-512

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An (r, λ)-system is an arrangement of v objects (or varieties) into subsets (or blocks) such that each variety appears in exactly r blocks and each pair of distinct varieties appears in exactly λ blocks. To avoid trivial designs, we assume that 1≤λ<r. 
Gardner, B. A Note on (r, λ)-Systems. Canadian mathematical bulletin, Tome 20 (1977) no. 4, pp. 511-512. doi: 10.4153/CMB-1977-077-5
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     title = {A {Note} on (r, {\ensuremath{\lambda})-Systems}},
     journal = {Canadian mathematical bulletin},
     pages = {511--512},
     year = {1977},
     volume = {20},
     number = {4},
     doi = {10.4153/CMB-1977-077-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1977-077-5/}
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