@article{10_4153_CJM_1975_082_2,
     author = {Clough, Robert R.},
     title = {The {Map} {SJ} {\textrightarrow} {SF} {Does} {Not} {Deloop} {Mod} 2},
     journal = {Canadian journal of mathematics},
     pages = {737--745},
     year = {1975},
     volume = {27},
     number = {4},
     doi = {10.4153/CJM-1975-082-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1975-082-2/}
}