Geodesic
On Critical r, λ-Systems
Canadian mathematical bulletin, Tome 19 (1976) no. 2, pp. 217-220

Voir la notice de l'article provenant de la source Cambridge University Press

Critical r, λ-systems are introduced such that any nontrivial r, λ-system must be an extension of some critical system. It is shown that parametric values for which critical systems can exist are restricted to λ(v-1) ≤ r(r-1) and, further, to λ(v-1)r(r-1) if the critical system is extendible. 
Vranch, J. On Critical r, λ-Systems. Canadian mathematical bulletin, Tome 19 (1976) no. 2, pp. 217-220. doi: 10.4153/CMB-1976-034-2
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