Cohomology Theory in Abstract Groups. I

Die Untergruppen der freien Gruppen

1927 • 284 citations

Cohomology Theory in Abstract Groups. II: Group Extensions with a non-Abelian Kernel

1947 • 219 citations

Fundamentalgruppe und zweite Bettische Gruppe

1941 • 196 citations

Erweiterung von Gruppen und ihren Isomorphismen

1934 • 117 citations

Homology of spaces with operators. I

1947 • 95 citations

Homotopy Relations in Fibre Spaces

1941 • 47 citations

Determination of the Second Homology and Cohomology Groups of a Space by Means of Homotopy Invariants

1946 • 42 citations

Group Rings and Extensions. I

1938 • 18 citations

The extensions of a group

1938 • 16 citations

Zu einer Arbeit von 0. schreier

1931 • 12 citations