NASA detects rare 'double quasar' in ancient corner of the universe
A quasar Milky Way six million years ago?, Space
Yale astronomer leads the way to the oldest known X-ray quasar
Quasar - Wikipedia
International team observes innermost structure of quasar jet, MIT News
Ancient Quasars and Massive Dark Matter Halos Reveal Black Hole Secrets
Decades-Old Mystery Surrounding Quasars Finally Solved - SpaceChatter
Brightest quasar ever found shines with the intensity of 600 trillion Suns
How do quasars get dressed?
Quasar (Illustration)
Hubble Finds That the Nearest Quasar Is Powered by a Double Black Hole
What we've learned in 60 years of studying quasars
Quasar spectrum shines a new light on unchanged fundamental constants – Physics World