@article{CM_1977__35_1_39_0, author = {Abels, Herbert}, title = {On a problem of {Freudenthal's}}, journal = {Compositio Mathematica}, pages = {39--47}, publisher = {Noordhoff International Publishing}, volume = {35}, number = {1}, year = {1977}, mrnumber = {466399}, zbl = {0352.22003}, language = {en}, url = {http://archive.numdam.org/item/CM_1977__35_1_39_0/} }