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  Sumida, K.; Natsumeda, T.; Miyamoto, K.; Silkin, I. V.; Kuroda, K.; Shirai, K.; Zhu, S.; Taguchi, K.; Arita, M.; Fujii, J.; Varykhalov, A.; Rader, O.; Golyashov, V. A.; Kokh, K. A.; Tereshchenko, O. E.; Chulkov, E.V.; Okuda, T.; Kimura, A.: Enhanced surface state protection and band gap in the topological insulator PbBi₄Te₄S₃. Physical Review Materials 2 (2018), p. 104201/1-8

10.1103/PhysRevMaterials.2.104201
Open Access Version