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by Amrhein, Ludwig; Backes, Gertrud M.; Harjes, Anne; et al.
by Ludwig Amrhein; Gertrud M. Backes; Anne Harjes; et al.
by Backes, Gertrud M.; Clemens, Wolfgang; Künemund, Harald
by Clemens, Wolfgang; Backes, Gertrud M.
by Pasero, Ursula; Backes, Gertrud M.; Schroeter, Klaus R.
by Gertrud M. Backes; ?Wolfgang Clemens; ?Harald Künemund