@article{CMH_1954__28_139083,
     author = {H. Samelson},
     title = {Groups and spaces of loops.},
     journal = {Commentarii mathematici Helvetici},
     pages = {278--287},
     publisher = {mathdoc},
     volume = {28},
     year = {1954},
     zbl = {0056.16801},
     url = {http://geodesic.mathdoc.fr/item/CMH_1954__28_139083/}
}