@article{10_4153_CJM_1981_022_7,
     author = {Liang, Chao-Chu},
     title = {\ensuremath{\sigma}4-Actions {On} {Homotopy} {Spheres}},
     journal = {Canadian journal of mathematics},
     pages = {275--281},
     year = {1981},
     volume = {33},
     number = {2},
     doi = {10.4153/CJM-1981-022-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1981-022-7/}
}