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by Euler, Leonhard; Bodenmann, Siegfried; Hug, Vanja; et al.
by Verdun, Andreas; Euler, Leonhard
by Euler, Leonhard; Fellmann, Emil A.; Mikhajlov, Gleb K.
by Euler, Leonhard; Kleinert, Andreas; Steiner, Thomas
by Fellmann, Emil A.; Gautschi, Erika; Gautschi, Walter
by Euler, Leonhard; Hewlett, John
by Euler, Leonhard