Nichiro KAWANO, Eiji YANAGIDA, Shoji YOTSUTANI "Structure theorems for positive radial solutions to div$\left(\right|{\mathrm{Du}}^{m-2}\mathrm{Du})+K(\left|x\right|)u^q=0$ in $R^n$," Journal of the Mathematical Society of Japan, J. Math. Soc. Japan 45(4), 719-742, (October, 1993)