@article{CMH_1957__32_139152,
     author = {Carl B. Allendorfer and James, Jr. Eells},
     title = {On the cohomology of smooth manifolds.},
     journal = {Commentarii mathematici Helvetici},
     pages = {165--179},
     publisher = {mathdoc},
     volume = {32},
     year = {1957},
     url = {http://geodesic.mathdoc.fr/item/CMH_1957__32_139152/}
}