Strain investigation of low strained buried gratings by grazing incidence X-ray diffraction and elasticity theoryD. Lübbert, T. Baumbach, S. Ponti, U. Pietsch, L. Leprince, J. Schneck and A. TalneauEurophys. Lett., 46 4 (1999) 479-485DOI: https://doi.org/10.1209/epl/i1999-00288-6