@misc{Dresler_A._Filter,
 author={Dresler, A.},
 howpublished={online},
 publisher={D. Bercovitz & Sohn},
 language={ger},
 title={Filter - Photron - Element},
 type={broszura},
 keywords={fotometria, radiotechnika, technika pomiarowa, teletechnika},
}