Optical Observations of Space Debris in High-Altitude Orbits Schildknecht, T. ; Musci, R. ; Flury, W. ; Kuusela, J. ; de Leon, J. ; Dominguez Palmero, L. De Fatima Abstract Publication: 4th European Conference on Space Debris Pub Date: August 2005 Bibcode: 2005ESASP.587..113S