Hutchins, Shana K. Giant Magellan Telescope to Cast Milestone Fourth Mirror. Texas A&M Today. September 18, 2015 [2015-12-17]. (原始內容存檔於2017-10-04). There is special significance to the fourth mirror. It will be the central unit. Without it, the other mirrors would be much more difficult to bring together to function as a single telescope. Also, our baseline plan starts the operations of the GMT with just these four mirrors, which will all have been cast once this one is complete.
Ketelsen, Dean, GMT polishing at Mirror Lab open house 14 Jan, 2012, 2012-01-15 [2012-04-08], (原始內容存檔於2016-06-10), While guests toured the facilities, the Lab staff ran both of our polishing machines on current projects, including this view of final polishing on the first GMT segment.
Telescope Structure(PDF). GMT Conceptual Design Report. February 2006. p. 7-17 § 7.4.5 [2007-10-07]. (原始內容存檔於2012-03-28). The center segment and cell will not have a spare, thus observations will be interrupted every one or two years for the 1–2 week period required to recoat that mirror.
Chapter 2: Overview(PDF), GMT Conceptual Design Report, p. 2-4 § 2.5.1, 2006 [2012-03-25], (原始內容存檔於2012-03-28), GMT is designed from the outset around adaptive optics (AO) with the goal of producing diffraction limited images at 1 μm and longer wavelengths.
Martina, H. M.; Burgea, J. H.; Davisa, J. M.; Kimb, D. W.; Kingsleya, J. S.; Lawa, K.; Loeffa, A.; Lutza, R. D.; Merrilla, C.; Strittmattera, P. A.; Tuella, M. T.; Weinbergera, S. N.; Westa, S. C. Navarro, Ramón; Burge, James H. , 編. Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II. SPIE Astronomical Telescopes + Instrumentation. Proc. SPIE 9912 (Edinburgh). 22 July 2016: 99120V. doi:10.1117/12.2234491. (原始內容存檔(PDF)於2016-12-20) 使用|archiveurl=需要含有|url= (幫助). 參數|journal=與模板{{cite conference}}不匹配(建議改用{{cite journal}}或|book-title=) (幫助); |contribution=被忽略 (幫助); 使用|accessdate=需要含有|url= (幫助)