%0 conference paper,conference lecture %@ %A Havermeyer, F.,Rupp, R.A.,Schubert, D.W.,Kraetzig, E. %D 1999 %J 2nd European Conference on Neutron Scattering, ECNS 99, Session C 04 %N %P 95 %T Neutron diffraction from holographic gratings in PMMA %U %X