@article{ ai-55-aHR0cHM6Ly93d3cuanN0b3Iub3JnL3N0YWJsZS8xOTkyOTA1, title = {Homotopy Groups of Joins and Unions}, journal = {Transactions of the American Mathematical Society}, volume = {83}, number = {1}, pages = {55-69}, author = {Whitehead, George W.}, publisher = {American Mathematical Society}, year = {1956}, issn = {0002-9947}, language = {English}, url = {https://www.jstor.org/stable/1992905}, url = {https://katalog.skd.museum/Record/ai-55-aHR0cHM6Ly93d3cuanN0b3Iub3JnL3N0YWJsZS8xOTkyOTA1} }