On the Number of Edges of Quadrilateral-Free Graphs

On a combinatorial problem

FA Dick de Bruijn, P. Erdös · 1948 · 406 citations

Natural Sciences, Mathematics, Algorithms +6

On Graphs that do not Contain a Thomsen Graph

William G. Brown · Canadian Mathematical Bulletin · 1966 · 390 citations · Full text

Natural Sciences, Computer Science, Mathematics +7

ON A PROBLEM OF GRAPH THEORY

A. Rényii, T. Sós · 1966 · 382 citations

Natural Sciences, Computer Science, Mathematics +8

Graphs without quadrilaterals

Zoltán Füredi · Journal of Combinatorial Theory Series B · 1983 · 112 citations

Polarities in finite projective planes

Reinhold Baer · Bulletin of the American Mathematical Society · 1946 · 94 citations · Full text

Natural Sciences, Mathematics, Discrete Mathematics +9