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1. CMB 2000 (vol 43 pp. 385)

Bluskov, I.; Greig, M.; Heinrich, K.
 Infinite Classes of Covering Numbers Let $D$ be a family of $k$-subsets (called blocks) of a $v$-set $X(v)$. Then $D$ is a $(v,k,t)$ covering design or covering if every $t$-subset of $X(v)$ is contained in at least one block of $D$. The number of blocks is the size of the covering, and the minimum size of the covering is called the covering number. In this paper we consider the case $t=2$, and find several infinite classes of covering numbers. We also give upper bounds on other classes of covering numbers. Categories:05B40, 05D05
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