Linked from
The 13 pages that link to Binary pulsar, each with the reason it gives.
PulsarBroader topic: Orbital timing in binary pulsars tests gravity and measures companion masses.
SpacetimeRelated: Its orbital changes provide precise evidence for dynamical spacetime effects.
PSR B1937+21Compared with: Many millisecond pulsars are in binaries, while PSR B1937+21 is isolated.
Russell Alan HulseNarrower topic: PSR B1913+16 became the first known example of this class.