@article{CMH_1983__58_139936,
     author = {Sylvain E. Cappell and Julius L. Shaneson},
     title = {Class numbers and periodic smooth maps.},
     journal = {Commentarii mathematici Helvetici},
     pages = {167--185},
     publisher = {mathdoc},
     volume = {58},
     year = {1983},
     zbl = {0528.57032},
     url = {http://geodesic.mathdoc.fr/item/CMH_1983__58_139936/}
}