Observation of an incommensurately modulated structure in dielectrics by an atomic-force microscopeA. V. Kityk, I. Muševič, G. Slak, A. Fuith and R. BlincEurophys. Lett., 36 5 (1996) 373-378DOI: https://doi.org/10.1209/epl/i1996-00238-x