@book {ecker_stark_2009, title = {stark bew{\"o}lkt. fl{\"u}chtige Erscheinungen des Himmels}, year = {2009}, note = {AK 2009/25}, publisher = {MUSA Museum Startgalerie Artothek}, organization = {MUSA Museum Startgalerie Artothek}, author = {Ecker, Berthold and Starl, Timm and Karel, Johannes and andere} }