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de Ng Dick Bruijn · Data Archiving and Networked Services (DANS) · 1946 · 1.3K citations · Full text
Some remarks on the theory of graphs
P. Erdös · Bulletin of the American Mathematical Society · 1947 · 664 citations · Full text
Paul Erdős · Canadian Journal of Mathematics · 1959 · 602 citations · Full text
On a Packing and Covering Problem
Vojtěch Rödl · European Journal of Combinatorics · 1985 · 414 citations