Intersection of finitely generated subgroups of free groups and resolutions of graphs

Combinatorial Group Theory.

P. M. Cohn, Wilhelm Magnus, A. Karrass et al. · American Mathematical Monthly · 1967 · 1.3K citations

Combinatorial group theory

Mose Newman · Journal of the Franklin Institute · 1967 · 654 citations

Topology of finite graphs

John R. Stallings · Inventiones mathematicae · 1983 · 541 citations

Natural Sciences, Mathematics, Combinatorics +9

On Certain Sets of Elements in a Free Group

J. H. C. Whitehead · Proceedings of the London Mathematical Society · 1936 · 170 citations

Natural Sciences, Mathematics, Set Theory +5

Subgroups of Finite Index in Free Groups

Marshall Hall · Canadian Journal of Mathematics · 1949 · 153 citations · Full text

Natural Sciences, Mathematics, Combinatorics +13