1. The GTC project: from commissioning to regular science operation: Current performance and first science results;Álvarez,2010
2. Cleaning large optics with CO2 snow;Zito,1990
3. Removal of adsorbed gases with CO2 snow;Zito,1991
4. Progress in the Optical Maintenance of the VLT;Giordano,2004
5. In-situ cleaning of the primary mirror of Subaru telescope;Torii,1998