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4. Yu. F. Shmal’ko, V.I. Kolosov, V.V. Solovey, L.A. Kennedy and S.A. Zelepouga, Int. J. Hydrogen Energy 23, 463–468 (1998).
5. A. Jemni and S. Ben Nasrallah, Ibid. 20, 43–52 (1995).