Geodesic
Fisher's inequality for tactical configurations
Matematičeskie zametki, Tome 4 (1968) no. 4, pp. 417-424.

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It is proved that for $l\geqslant4$ the number $b$ of blocks of a tactical configuration $C(k,l,\lambda,v)$ is at least equal to $\tbinom{v}{2}$. 
@article{MZM_1968_4_4_a4,
     author = {A. Ya. Petrenyuk},
     title = {Fisher's inequality for tactical configurations},
     journal = {Matemati\v{c}eskie zametki},
     pages = {417--424},
     publisher = {mathdoc},
     volume = {4},
     number = {4},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_4_4_a4/}
}
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A. Ya. Petrenyuk. Fisher's inequality for tactical configurations. Matematičeskie zametki, Tome 4 (1968) no. 4, pp. 417-424. http://geodesic.mathdoc.fr/item/MZM_1968_4_4_a4/