Roybal, W. Advanced Telescope Design, Fabrication, and Control. SPIE Digital Library.
Tohutoru Kātū Chicago (17th ed.)Roybal, William. Advanced Telescope Design, Fabrication, and Control. SPIE Digital Library.
Tohutoro MLA (9th ed.)Roybal, William. Advanced Telescope Design, Fabrication, and Control. SPIE Digital Library.
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