TY - JOUR AU - Liang, Chao-Chu TI - σ4-Actions On Homotopy Spheres JO - Canadian journal of mathematics PY - 1981 SP - 275 EP - 281 VL - 33 IS - 2 UR - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1981-022-7/ DO - 10.4153/CJM-1981-022-7 ID - 10_4153_CJM_1981_022_7 ER -