@conferenceObjectPart{OliveiraKrugKünstleSchmidt_1994, title={The production of Fresnel lenses in sol-gel derived Ormocers by holography}, author={Oliveira, Peter William de and Krug, Herbert and Künstle, Holger C. and Schmidt, Helmut K.}, isbn={0-8194-1612-6}, doi={http://dx.doi.org/10.22028/D291-24450}, year={1994} }