Media type: E-Article Title: On Join Operations in Homotopy Groups Contributor: Barratt, M. G.; Hilton, P. J. imprint: Wiley, 1953 Published in: Proceedings of the London Mathematical Society Language: English DOI: 10.1112/plms/s3-3.1.430 ISSN: 0024-6115 Origination: Footnote: