Trimble, V.; Ceja, J. A. (2010). "Productivity and impact of astronomical facilities: A recent sample". Astronomische Nachrichten. 331 (3). s. 338. Bibcode:2010AN....331..338T. doi:10.1002/asna.200911339.
Trimble, V.; Ceja, J. A. (2010). "Productivity and impact of astronomical facilities: A recent sample". Astronomische Nachrichten. 331 (3). s. 338. Bibcode:2010AN....331..338T. doi:10.1002/asna.200911339.