History: The Spherical Aberration Problem | ESA/Hubble | ESA/Hubble
Some Feared Mirror Flaws Even Before Hubble Orbit - The New York Times
Is it true that the initial problem with the Hubble Space Telescope is that they had the 2 lenses made at Specsavers on a buy one get one free? - Quora
What was wrong with Hubble's mirror, and how was it fixed? | BBC Sky at Night Magazine
Rogue light led to Hubble's crooked mirror | New Scientist
Problem 5 - Hubble Telescope The Hubble Telescope | Chegg.com