Precise radial velocities of giant stars - VIII. Testing for the presence of planets with CRIRES infrared radial velocitiesTrifon Trifonov, Sabine Reffert, Mathias Zechmeister, Ansgar Reiners and Andreas QuirrenbachA&A, 582 (2015) A54DOI: https://doi.org/10.1051/0004-6361/201526196