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2. Diseases of the Heart;Mackenzie,1908
3. Zur Analyse des unregelmässigen Pulses;Wenckebach;Z Klin Med,1899
4. Ueber myogene Selbstregulirung der Herztaetikeit;Engelmann;Verh Kon Acad Wetensch Amsterdam,1896
5. Briefe;Billroth,1922