@unpublished{TUW-167808, author = {Leeb, Walter}, title = {Communications to and from HAPs - with laser beams?}, year = {2008}, keywords = {High altitude platforms, HAP, laser communication}, note = {invited; talk: High Altitude Platforms and their Applications (HAPCOS), COST297 Meeting, Friedrichshafen; 2008-10-08 -- 2008-10-10} }