Lithium abundance and 6Li/7Li ratio in the active giant HD 123351 - I. A comparative analysis of 3D and 1D NLTE line-profile fitsA. Mott, M. Steffen, E. Caffau, F. Spada and K. G. StrassmeierA&A, 604 (2017) A44DOI: https://doi.org/10.1051/0004-6361/201730409