Every group is an outer automorphism group of a finitely generated group

Combinatorial group theory

Gian‐Carlo Rota · Advances in Mathematics · 1978 · 866 citations

Topology of finite graphs

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

Natural Sciences, Mathematics, Combinatorics +9

Subgroups of small Cancellation Groups

Eliyahu Rips · Bulletin of the London Mathematical Society · 1982 · 241 citations

Natural Sciences, Communication, Combinatorics +6

Isometry transformations of hyperbolic 3-manifolds

Sadayoshi Kojima · Topology and its Applications · 1988 · 77 citations

Natural Sciences, Plastic Surgery, Geometry +10

On Dehn's algorithms for the conjugacy and word problems, with applications

Martin Greendlinger · Communications on Pure and Applied Mathematics · 1960 · 76 citations

Computing, Computer Science, Mathematics +5