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Bzowski, M.; Czechowski, A.; Frisch, P. C.; Fuselier, S. A.; Galli, André; Grygorczuk, J.; Heerikhuisen, J.; Kubiak, M. A.; Kucharek, H.; McComas, D. J.; Möbius, E.; Schwadron, N. A.; Slavin, J.; Sokół, J. M.; Swaczyna, P.; Wurz, Peter; Zirnstein, E. J. (2019). Interstellar Neutral Helium in the Heliosphere from IBEX Observations. VI. The He + Density and the Ionization State in the Very Local Interstellar Matter. Astrophysical journal, 882(1), p. 60. Institute of Physics Publishing IOP 10.3847/1538-4357/ab3462
