@inproceedings{SkalaDoehringHudec2017, author = {Petr Skala and Thorsten D{\"o}hring and Rene Hudec}, title = {Colors of the universe - market study on optical filters for professional astronomy}, booktitle = {DGaO-Proceedings}, volume = {2017}, number = {2017}, url = {http://www.dgao-proceedings.de/download/118/118_p30.pdf}, year = {2017}, }