On the Possibility of Helium Adsorption in Nitrogen Doped Graphitic Materials
S. Kumar Sahoo, J.J. Heske, S. Azadi, Z. Zhang,  Nadezda  V  Tarakina, M. Oschatz, R. Z. Khaliullin,  Markus  Antonietti, T. Kühne, Scientific Reports 10 (2020).