The article mentions Larry Niven’s A Gift From Earth, but in fact Bussard Ramjets are tightly integrated into several of the stories in Niven's Known Space [0]

The article mentions Larry Niven’s A Gift From Earth, but in fact Bussard Ramjets are tightly integrated into several of the stories in Niven's Known Space [0] sequence. Briefly, humanity sends colonists to several nearby stars in manned Bussard Ramjet ships. Eventually, humans encounter aliens who sell them the secret of an FTL drive, and the ramjet ships become obsolete. Several plot-points in the Known Space stories relate to the quirks of the planets colonised by the Ramjet crews, and in one short story (The Ethics of Madness), a significant part of the plot is a chase across spacetime of two men in separate Ramjet ships [0] https://en.wikipedia.org/wiki/Known_Space https://en.wikipedia.org/wiki/Known_Space