Jg. Peng et Zz. Tang, BROUWER DEGREES OF GRADIENT MAPS OF ISOPARAMETRIC FUNCTIONS, Science in China. Series A, Mathematics, Physics, Astronomy & Technological Sciences, 39(11), 1996, pp. 1131-1139
The Brouwer degree of every isoparametric gradient map has been given
by using moving frame. It has been used to construct the harmonic repr
esentations of the elements of homotopy groups of the spheres.