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Relations between packing and covering numbers of a tree
A. Meir, J. W. Moon · Pacific Journal of Mathematics · 1975 · 285 citations · Full text
Norman Biggs · Journal of Combinatorial Theory Series B · 1973 · 264 citations
On packing and covering numbers of graphs
Jerzy Topp, Lutz Volkmann · Discrete Mathematics · 1991 · 36 citations