Golasinski, M., Goncalves, D. and Wong, P. (2005) “Generalizations of Fox Homotopy Groups, Whitehead Products, and Gottlieb Groups”, Ukrains’kyi Matematychnyi Zhurnal, 57(3), pp. 320–328. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3600 (Accessed: 26 April 2025).