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by Clausius, Rudolf
by Drselen, Paul R.
by Nohle, Carl
by Rosenmller, Max Clemens
by Anonymous
by Friess, Gottfried Edmund
by Franz, Joachim; Gunther, Rosmarie; Stupperich, Reinhard
by Erd, Julian
by Wittmeier, Felix
by Ferber, Nora