Proving strong magnetic fields near to the central black hole in the quasar PG0043+039 via cyclotron linesW. Kollatschny, N. Schartel, M. Zetzl, M. Santos-Lleó, P. M. Rodríguez-Pascual and L. BalloA&A, 577 (2015) L1DOI: https://doi.org/10.1051/0004-6361/201525984
