... Camilo, F.) 2002, «The next Geminga: deep multiwavelength observations of a neutron ... 2: Molecular clouds and deep fields», A&A 278, 161 203. ... source 3EG J1835+5918 detected in the ROSAT all-sky survey», ApJ 547, L137 277 ...
... used observations carried out with Schmidt telescopes or the Digitized Sky Survey (DSS) to determine the positions of stars ... The instrument has no distortion, unlike Schmidt telescopes widely used in deep surveys. ...