Stephan Kiemle Burkhard Freitag Providing Context-Sensitive Access to the Earth Observation Product Library. 223-234 2007 conf/ercimdl/2007 ECDL http://dx.doi.org/10.1007/978-3-540-74851-9_19 db/conf/ercimdl/ecdl2007.html#KiemleF07