Variation of the magnetic field of the Ap star HD 50169 over its 29-year rotation period. - Mathys, G.; Romanyuk, I. I.; Hubrig, S.; Kudryavtsev, D. O.; Landstreet, J. D.; Schöller, M.; Semenko, E. A.; Yakunin, I. A. (Astronomy & Astrophysics / Astronomie et Astrophysique, 2019)