Golasinski M, Goncalves D, Wong P. Generalizations of Fox Homotopy Groups, Whitehead Products, and Gottlieb Groups. Ukr. Mat. Zhurn. [Internet]. 2005Mar.25 [cited 2024Nov.22];57(3):320–328. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3600