A note on groups with torsion-free abelianization and trivial multiplicator. Ralph Strebel — 1979 Commentarii mathematici Helvetici
Homological Methods Applied to the Derived Series of Groups Ralph Strebel — 1974 Commentarii mathematici Helvetici
Explicit resolutions for the binary polyhedral groups and for other central extensions of the triangle gorups. Ralph Strebel — 1983 Commentarii mathematici Helvetici
Almost finitely presented soluble groups. Robert Bieri; Ralph Strebel — 1978 Commentarii mathematici Helvetici
A geometric invariant for modules over an Abelian group. Robert Bieri; Ralph Strebel — 1981 Journal für die reine und angewandte Mathematik