https://impacts.ucar.edu/en/publications/the-hd-217107-planetary-system-twenty-years-of-radial-velocity-me/
The HD 217107 planetary system: Twenty years of radial velocity measurements - Impacts @ NSF NCAR...
https://impacts.ucar.edu/en/publications/the-hd-217107-planetary-system-twenty-years-of-radial-velocity-me/fingerprints/
The HD 217107 planetary system: Twenty years of radial velocity measurements - Fingerprint -...
twenty years