Stability of the interstellar hydrogen inflow longitude from 20 years of SOHO/SWAN observationsD. Koutroumpa, E. Quémerais, O. Katushkina, R. Lallement, J.-L. Bertaux and W. SchmidtA&A, 598 (2017) A12DOI: https://doi.org/10.1051/0004-6361/201629840
