TY - JOUR AU - Putman, Andrew TI - Obtaining presentations from group actions without making choices JO - Algebraic and Geometric Topology PY - 2011 SP - 1737 EP - 1766 VL - 11 IS - 3 UR - http://geodesic.mathdoc.fr/articles/10.2140/agt.2011.11.1737/ DO - 10.2140/agt.2011.11.1737 ID - 10_2140_agt_2011_11_1737 ER -