%0 conference poster %@ %A Emmler, T.,Tsetsgee, O.,Buntkowsky, G.,Weinmann, M.,Aldinger, F.,Mueller, K. %D 2007 %J Rocky Mountain Conference on Analytical Chemistry %N %P %T 11B{15N} REDOR and 11B spin echo studies for structural characterization of Si-B-C-N precursor ceramics %U %X