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by Gottfried Vossen; Kurt-Ulrich Witt
by Gottfried, Kurt; Blair, Bruce G.
by Bell, J. S.; Gottfried, Kurt; Veltman, Martinus; et al.
by Bell, M.; Gottfried, Kurt; Veltman, Martinus
by Gottfried, Kurt; Yan, Tung-Mow
by Vossen, Gottfried; Witt, Kurt-Ulrich
by Gottfried, Kurt; Brackern, Paul