2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/201390We complete an earlier derivation of the 4-point bosonic scattering amplitudes, and of the corresponding linearized local supersymmetric invariants in D=11 supergravity, by displaying the form-curvature, F^2 R^2, terms.2 pages. One typo corrected; note added on comparison with D=10 string expansion invariants. Accepted for publication in Phys. Rev. D15High Energy Physics - Theorytext