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by Gumzej, Roman; Halang, Wolfgang A.
by Kyamakya, Kyandoghere; Halang, Wolfgang A.; Mathis, Wolfgang; et al.
by Wotte, Joris; Halang, Wolfgang A.; Kramer, Bernd J.
by Halang, Wolfgang A.; Holleczek, Peter
by Halang, Wolfgang A.
by Wang, Xia; Halang, Wolfgang
by Halang, Wolfgang A.; Konakovsky, Rudolf M.