Hc. Yang et Qm. Cheng, AN ESTIMATE OF THE PINCHING CONSTANT OF MINIMAL HYPERSURFACES WITH CONSTANT SCALAR CURVATURE IN THE UNIT-SPHERE, Manuscripta mathematica, 84(1), 1994, pp. 89-100
Let M(n) (n > 3) be a closed minimal hypersurface with constant scalar
curvature in the unit sphere S(n+1)(1) and S the square of the length
of its second fundamental form. In this paper we prove that S > n imp
lies estimates of the form S > n + cn - d with c greater-than-or-equal
-to 1/4. For example, for n > 17 and S > n we prove S > n + 1/4n which
is sharper than a recent result of the authors [5]