Homological stability for automorphism groups of free groups. Allen Hatcher (1995) Commentarii mathematici Helvetici
Homology Fibrations and the "Group-Completion" Theorem. D. McDuff, G. Segal (1976) Inventiones mathematicae
Homology Operations in the Eilenberg-Moore Spectral Sequence. Hans Ligaard, Ib Madsen (1975) Mathematische Zeitschrift
Homotopy properties of Hamiltonian group actions. Kȩdra, Jarek, McDuff, Dusa (2005) Geometry & Topology