Walker, D.D. and D'Arrigo, P. (1996) On the Stability of Cassegrain Spectrographs'. Monthly Notices of the Royal Astronomical Society, 281. pp. 673-678. ISSN 0035-8711

Gravity-induced flexure has been a long-standing challenge in Cassegrain
spectrographs at 4-m class telescopes; it is more so on the scale of 8-m telescopes.
This is of particular concern for the Gemini High Resolution Optical Spectrograph,
which will be Cassegrain-mounted for its routine mode of operation. In this paper
we address the general flexure problem and make specific recommendations. In a
companion paper we present results on experimental compensation for flexure in a
specific Cassegrain spectrograph - ISIS on the 4.2-m William Herschel Telescope

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