@article{CMH_1987__62_140092,
     author = {R.L. Cohen and G.E. Carlsson},
     title = {The cyclic groups and the free loop space.},
     journal = {Commentarii mathematici Helvetici},
     pages = {423--449},
     publisher = {mathdoc},
     volume = {62},
     year = {1987},
     zbl = {0632.57028},
     url = {http://geodesic.mathdoc.fr/item/CMH_1987__62_140092/}
}