@conferenceObjectPart{SchmidtKrugKasemannMerlGerhardBrückTiefensee_1992,
title={Optical materials produced by sol-gel reactions},
author={Schmidt, Helmut K. and Krug, Herbert and Kasemann, Reiner and Merl, Norbert and Gerhard, Volker and Brück, Stefan and Tiefensee, Frank},
isbn={981-021332-8},
doi={http://dx.doi.org/10.22028/D291-24409},
year={1992}
}