@article{ ai-55-aHR0cHM6Ly93d3cuanN0b3Iub3JnL3N0YWJsZS8xOTY5NDY2, title = {The (n + 2)ndHomotopy Group of the n-Sphere}, journal = {Annals of Mathematics}, volume = {52}, number = {2}, pages = {245-247}, author = {Whitehead, George W.}, publisher = {Princeton University}, year = {1950}, issn = {0003-486X}, language = {English}, url = {https://www.jstor.org/stable/1969466}, url = {https://katalog.skd.museum/Record/ai-55-aHR0cHM6Ly93d3cuanN0b3Iub3JnL3N0YWJsZS8xOTY5NDY2} }