Nyamoradi, N. “On a <i>p</I&gt; -Laplacian System With Critical Hardy - Sobolev Exponents and Critical Sobolev Exponents”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 64, no. 6, June 2012, pp. 797-10, https://umj.imath.kiev.ua/index.php/umj/article/view/2617.